Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
High [CVE-2026-70463] Authorization bypass via `auth users` directive parsing
rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing. The auth users parser uses comma-only tokenization when splitting the user list, which fails to correctly handle entries of the form @Group Name where the group name contains a space. The space within the group name causes the parser to split the entry at the space boundary, discarding the deny rule associated with the group. An authenticated user whose username or group membership would be denied by an @Group Name auth users entry can connect to a restricted module because the deny rule is silently discarded during parsing. An authorization bypass flaw was found in the rsync daemon. The auth users directive parser incorrectly handles group names containing spaces due to comma-only tokenization. This flaw causes deny rules to be silently discarded, allowing an authenticated user to bypass restrictions and gain unauthorized access to restricted modules. The flaw allows an authenticated, but unauthorized, user to access restricted rsync modules due to incorrect parsing of deny rules. This bypass occurs because the rsync parser fails to properly tokenize group names with embedded spaces, silently discarding intended access restrictions. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-863.
High [CVE-2026-70464] Denial of Service via handshake stall
rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients. An unauthenticated remote attacker can stall the handshake process by opening multiple concurrent connections and trickling data or stalling prior to module selection. This bypasses standard timeouts and exhausts all available connection slots, preventing legitimate clients from connecting. An unauthenticated remote attacker can exhaust available connection slots by stalling the handshake process, preventing legitimate clients from connecting. This vulnerability primarily affects systems where the rsync daemon is explicitly enabled and exposed to untrusted networks. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 3 more.
High [CVE-2026-53795] Arbitrary file write via --temp-dir or --link-dest options
rsync before 3.5.0 contains an arbitrary file write vulnerability that allows attackers to write files outside the intended destination tree by specifying an absolute path via --temp-dir or --link-dest options. The rename-confinement logic is bypassed when these options resolve to paths outside the destination tree, enabling attacker-controlled values to write files to arbitrary locations accessible to the rsync process. A flaw was found in rsync. This bypasses the rename-confinement logic, allowing the attacker to write files to arbitrary locations outside the intended destination tree, potentially leading to unauthorized data modification or system disruption. This occurs when a user is tricked into executing rsync with attacker-controlled absolute paths via the `--temp-dir` or `--link-dest` options, bypassing path confinement. The requirement for user interaction to supply malicious input prevents this from being a Critical severity issue. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462. Affected products named by the advisory: Red Hat package: rsync.
High [CVE-2026-53793] rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode
rsync before 3.5.0 contains a path confinement bypass vulnerability that allows remote clients to escape the intended inner-module root confinement by constructing paths that resolve outside the chroot boundary when the module root contains a /./ boundary marker. Attackers can exploit improper handling of the /./ notation or forge delta-basis transfers referencing xname paths that cross the /./ boundary to gain unauthorized read or write access to files outside the module's subtree. A flaw was found in rsync. This vulnerability allows remote clients to bypass path confinement, a security measure designed to restrict file access. By crafting specific paths that include a '/./' boundary marker within a chroot environment, an attacker can gain unauthorized read or write access to files outside the intended module's directory. This could lead to sensitive information disclosure or data manipulation. Successful exploitation could lead to unauthorized read and write access to files outside the intended chroot environment, though the attack complexity is high. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.
High [CVE-2026-53791] rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address. This allows unauthorized access to restricted resources. Note: Red Hat Enterprise Linux 8 and earlier versions do not contain the vulnerable PROXY protocol implementation and are not affected. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-290. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462. Affected products named by the advisory: Red Hat package: rsync.
High [CVE-2026-53790] rsync < 3.5.0 Command Injection via Multiple Code Paths
rsync before 3.5.0 contains multiple command and argument injection vulnerabilities that allow attackers to execute arbitrary commands by supplying malicious input through several code paths, including the RSYNC_CONNECT_PROG environment variable, daemon hooks, the rsync-ssl wrapper, and remote-shell command newline injection. Attackers can inject shell metacharacters or newline characters into unsanitized user-supplied values such as hostnames and hostspecs to execute arbitrary commands under the privileges of the rsync process or the invoking user. This Important vulnerability in rsync allows for remote command injection due to insufficient sanitization of user-supplied input across multiple code paths. While the attack complexity is high, successful exploitation could lead to arbitrary command execution under the privileges of the rsync process or the invoking user, impacting confidentiality, integrity, and availability. This risk is particularly relevant in environments where rsync is used for remote synchronization with untrusted sources or destinations. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-78. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.
High [CVE-2026-53785] Arbitrary file write via path traversal in --relative mode
rsync before 3.5.0 contains a path traversal vulnerability that allows a malicious sender to write files outside the intended destination directory tree by crafting relative paths with symlink components in --relative mode. The make_path() function follows symlinks pointing outside the destination tree while creating intermediate directories without verifying that created paths remain within the destination boundary, enabling arbitrary file writes on the receiver's filesystem. This is an Important vulnerability in rsync where a malicious sender can achieve arbitrary file writes on a receiving system when the `--relative` mode is used. The risk is present in environments where rsync is configured to pull data from untrusted sources with the `--relative` option. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.22; Red Hat Cost Management On-Premise 1; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:74095, RHSA-2026:67462, RHSA-2026:71446, RHSA-2026:79357. Affected products named by the advisory: Red Hat package: rsync.
High [CVE-2026-53784] Unauthorized File Access via Symlink Module Root
rsync before 3.5.0 contains a path traversal vulnerability that allows remote clients to access files outside the intended module root when use chroot is disabled and the module root path or a component of it is a symlink. The daemon calls chdir() to the module root at session initialization without resolving symlinks via realpath() or equivalent, causing subsequent relative-path operations to reference files relative to the symlink target rather than the intended module root, enabling unauthorized file access. A flaw was found in rsync. This is an Important flaw. The rsync daemon is vulnerable to unauthorized file access via path traversal when configured with a symlinked module root and the `use chroot` option is explicitly disabled. This configuration is not default, but if present, a local attacker with low privileges could exploit this to read or write files outside the intended module root. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462. Affected products named by the advisory: Red Hat package: rsync.
High [CVE-2026-53783] Directory escape via TOCTOU race condition in rrsync
rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree. By replacing a validated path component with a symbolic link prior to file transfer execution, an attacker can bypass intended boundary controls and read or write arbitrary files outside the designated directory. An Important TOCTOU race condition in rsync's rrsync wrapper allows authenticated users to manipulate symlinks and escape directory boundaries, granting unauthorized read and write access to files outside the intended subtree. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Red Hat lists Red Hat OpenShift Container Platform 4 as not affected. Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462.
High [CVE-2026-53803] Local Privilege Escalation via Symlink Following
rsync before 3.5.0 contains a symlink following vulnerability that allows local attackers to overwrite arbitrary files by placing a symlink at a predictable output path such as --log-file, --write-batch, or daemon-mode log and statistics paths. Attackers can exploit rsync's failure to reject symlinks during ancillary file writes to redirect output to arbitrary filesystem locations, achieving local privilege escalation on installations where rsync runs with elevated privileges such as setuid or privileged daemon configurations. This Important vulnerability in rsync allows a local attacker to achieve privilege escalation by exploiting a symlink following flaw. In Red Hat environments, the risk is elevated when rsync is configured to run with elevated privileges, such as setuid or in daemon mode, enabling an attacker to overwrite arbitrary files. The requirement for local access and specific privileged configurations prevents a Critical impact. Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-59. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.22; Red Hat Cost Management On-Premise 1; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4.
High [CVE-2026-73508] Denial of Service via Memory Leak in DNS Record Decoder with Malformed Domain Names
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns. DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns. DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. When processing malformed domain names in DNS packets, the DNS record decoder fails to release allocated memory. An unauthenticated remote attacker who can send DNS traffic to an application using the affected DNS resolution functionality can incrementally exhaust available memory until the process becomes unresponsive, resulting in a complete denial of service. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-772. Affected products named by the advisory: Red Hat Build of Debezium 3.6; Red Hat Data Grid 8.6.3; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8; and 10 more.
High [CVE-2026-73507] Denial of Service via CPU Exhaustion in XmlFrameDecoder
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.xml. XmlFrameDecoder.decode() failed to preserve closing-tag parser state across invocations, so an unauthenticated remote attacker could trickle-feed repeated Affected products named by the advisory: Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16; Red Hat Single Sign-On 7.
High [CVE-2026-73505] Arbitrary command execution via template injection in directory names
Oh My Posh is the most customisable and low-latency cross platform/shell prompt renderer. Prior to 29.35.1, the setStyle() function in src/segments/path.go passed pt.Path, which includes raw folder names, to template. Render, whose function map exposes cmd, so an attacker-controlled directory name containing a Go template expression could execute arbitrary operating system commands as the current user whenever the prompt rendered inside that directory or a descendant. This issue is fixed in version 29.35.1. A flaw was found in Oh My Posh. This could lead to unauthorized command execution. Red Hat does not ship Oh My Posh in any supported products. The oh-my-posh package is available in Fedora and is maintained by the community. Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-78.
High [CVE-2026-14456] Denial of Service via unbounded memory growth in QUIC server
Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unknown destination connection IDs, it can allocate and queue new incoming channels without enforcing any limit. Impact summary: A remote peer that can make many Initial packets reach the server listener faster than the application accepts connections, can cause the memory allocated to store the per-channel state to grow without any limits, potentially making the QUIC listener unavailable and causing Denial of Service. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The function that handles inbound QUIC packets uses Connection-Id from the packet header to find an existing connection (QUIC channel). If no existing connection is found and the packet type is INITIAL, the function treats the packet as a new connection. It allocates a new channel object and inserts it into a queue where it waits to be accepted by the local application with SSL_accept(3ossl). The memory occupied by these initial channel objects may grow without bounds if the application is not able to call SSL_accept() frequently enough to serve these inbound connection requests. The issue is present since OpenSSL 3.5 when the QUIC server implementation was added. The fix introduces a limit for pending connections.
High [CVE-2026-66804] Authenticated SSRF via user-controlled towerHost in /ansibletower handler
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally. A flaw was found in the console component. An authenticated user can exploit a Server-Side Request Forgery (SSRF) vulnerability by manipulating the `towerHost` parameter when accessing the `/ansibletower` handler. This allows the user to bypass pathname validation and access arbitrary internal or external hosts. The primary consequence is the exfiltration of full HTTP responses, leading to information disclosure from the affected system. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). Weakness: CWE-918. Affected Red Hat products: multicluster engine for Kubernetes 2.10; multicluster engine for Kubernetes 2.11; multicluster engine for Kubernetes 2.17; multicluster engine for Kubernetes 2.6; multicluster engine for Kubernetes 2.8; multicluster engine for Kubernetes 2.9; Red Hat Advanced Cluster Management for Kubernetes 2.11; Red Hat Advanced Cluster Management for Kubernetes 2.13; Red Hat Advanced Cluster Management for Kubernetes 2.14; Red Hat Advanced Cluster Management for Kubernetes 2.15; Red Hat Advanced Cluster Management for Kubernetes 2.16; Red Hat Advanced Cluster Management for Kubernetes 2.17.
High [CVE-2026-6471] Arbitrary code execution via logical decoding plugin
Missing authorization in PostgreSQL logical decoding allows a non-superuser holding REPLICATION privilege to dlopen any file visible to the operating system account running the server, via the choice of logical decoding plugin. This in turn runs arbitrary code as that account. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. A flaw was found in PostgreSQL. Exploitation requires an attacker to already have significant access to the database, specifically the REPLICATION role, which is not granted by default to typical users, thus reducing the overall risk. Red Hat severity: Important — CVSS 7.2 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-94. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 10 more.
High [CVE-2026-14671] Arbitrary code execution via type confusion in 'refint' module
Type confusion in PostgreSQL module "refint" allows an object creator to execute arbitrary code as the operating system user running the database. The fix for this emerged as a non-security bug report, and the fix appear in the git repository with subject "refint: Remove plan cache.", without a CVE number. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. A flaw was found in PostgreSQL. This could lead to a complete compromise of the database server. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-843. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 12 more.
High [CVE-2026-6464] PostgreSQL psql: Arbitrary command execution via untrusted data in COPY FROM STDIN
Untrusted data inclusion in PostgreSQL psql COPY may allow a server administrator to elicit execution of data lines as psql commands, via error injection. If the "COPY FROM STDIN" or "\copy FROM STDIN" command fails before the server indicates that it awaits input rows, psql processes the in-line data rows as psql commands. "COPY FROM" with a filename is unaffected. The server administrator has no inherent control over the data rows, so a complete attack requires the attacker to separately acquire control of both the server and the data rows. Alternatively, an attacker controlling data rows alone might complete an attack through a coincidental error that they don't control. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. During the `COPY FROM STDIN` operation, untrusted data can be mistakenly interpreted as psql commands if an error injection causes the command to fail prematurely. This could allow an attacker to achieve arbitrary command execution. Successful exploitation requires the attacker to control both the server and the data being copied, or to leverage a coincidental error while controlling only the data. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-829.
High [CVE-2026-19385] PostgreSQL pg_dump: Arbitrary code execution via crafted transform lists
Heap buffer overflow in PostgreSQL pg_dump of long function transform lists allows an object creator to execute arbitrary code as the operating system user running pg_dump, via a crafted transform list. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. An authenticated object creator can exploit this by providing a specially crafted transform list. Attackers with object-creation privileges can use crafted function transform lists to run OS commands as the backup user. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-122. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 11 more.
High [CVE-2026-18408] Arbitrary code execution via untrusted data inclusion in pg_dump
Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the origin server to inject arbitrary code for restore-time execution as the client operating system account running psql to restore the dump, via psql \restrict meta-command input expansion. The fix for CVE-2025-8714 introduced \restrict and \unrestrict to block this attack, but \unrestrict itself was sufficient for an attack. pg_dumpall is also affected. pg_restore is affected when used to generate a plain-format dump. Non-core use of \restrict would be affected, but we've not identified non-core use. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. An Important-rated vulnerability in PostgreSQL allows a malicious superuser on an origin server to compromise client systems during a database restore. By injecting arbitrary code into a database dump, the attacker can trigger execution when the file is processed by a victim's psql client. This runs the malicious code with the operating system privileges of the user performing the restore, effectively escalating access from the compromised database server to the client machine. Red Hat severity: Important — CVSS 8.4 (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-829.