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High [CVE-2026-59874] Denial of Service via malformed tar archive header
node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, tar.replace accepts a checksum-valid tar header with a negative base-256 encoded entry size, causing the archive scanner to make no progress while repeatedly parsing the same header. This issue is fixed in version 7.5.18. A remote attacker could exploit this vulnerability by providing a specially crafted tar archive with a negative entry size in its header. This malformed header causes the archive scanner to enter an infinite loop, repeatedly parsing the same header and preventing further processing. This can lead to a denial of service (DoS) condition, making the affected system or application unresponsive. This Important denial of service flaw in node-tar affects Red Hat products that process untrusted tar archives. A remote attacker can provide a specially crafted archive with a malformed header, leading to an infinite loop during parsing and causing the application to become unresponsive. 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-606. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Ansible Automation Platform 2.2; and 27 more.
High [CVE-2026-59873] Denial of Service via crafted gzip bomb
node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.19, node-tar does not enforce hard upper bounds on total decompressed data, entry counts, or decompression ratio in extraction and parsing paths such as src/extract.ts, allowing a small crafted gzip bomb to exhaust disk space and CPU. This issue is fixed in version 7.5.19. This vulnerability allows a remote attacker to craft a small gzip bomb, which, when processed, can lead to the exhaustion of disk space and CPU resources. The primary impact is a Denial of Service (DoS), making the affected system or application unavailable. This vulnerability in node-tar is rated as Important. A remote attacker can exploit the lack of strict limits on decompressed data and entry counts within the library's archive processing to craft a gzip bomb. 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 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Ansible Automation Platform 2.2; and 30 more. Affected products named by the advisory: Red Hat OpenShift AI 3.4; Red Hat OpenShift Container Platform 4.20; Red Hat OpenShift Container Platform 4.21; Red Hat OpenShift Container Platform 4.22; and 26 more.
High [CVE-2026-59868] Denial of Service via quadratic CPU time parsing with merge keys
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0. This can lead to a significant increase in CPU time required to parse the document, resulting in a Denial of Service (DoS) for the affected system. js-yaml versions 5.0.0 through 5.1.x are vulnerable to a denial of service. This can be triggered via yaml.load() on untrusted YAML input that uses merge keys. 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-1333. Affected Red Hat products: Red Hat Hardened Images; Red Hat Discovery 2.
High [CVE-2026-59869] Denial of Service via crafted YAML documents
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0. A remote attacker could exploit this vulnerability by providing a specially crafted YAML document containing a chain of mappings with merge keys. This could cause the parser to consume excessive CPU resources, leading to a Denial of Service (DoS) for the affected system. This vulnerability is rated as Important. Red Hat products utilizing `js-yaml` to process untrusted YAML input are susceptible to a denial of service, as a remote attacker can provide a crafted document that consumes excessive CPU resources. This is considered Important due to the potential for service disruption without requiring authentication or complex attack vectors. 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-606. Affected products named by the advisory: Red Hat Enterprise Linux 10; Streams for Apache Kafka 3.2.1; multicluster engine for Kubernetes 2.10; multicluster engine for Kubernetes 2.11; and 46 more.
High [CVE-2026-59870] Denial of Service via crafted YAML ordered-map document
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the!!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1. An attacker could exploit this by providing a specially crafted YAML ordered-map document. This could lead to excessive CPU consumption, resulting in a denial of service (DoS) for applications processing the malicious YAML input. This affects yaml.load() calls using that schema. 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 Red Hat products: Red Hat Hardened Images; Red Hat Discovery 2.
High [CVE-2026-44918] Prevent rehoming resources to nodes with different owner
OpenStack Ironic through before 37.0.1 allows creation or modification of nodes cross-project without authorization. An authenticated project manager can change the node associated with Volume Connectors or Volume Target objects, potentially changing the project permitted to access the object. Volume Connectors contain secrets in environments configuring boot from volume with iSCSI volumes. Additionally, a project manager with the ability to create nodes can use the UUID of a node not owned by their project as a parent node when creating a new node. This mismatched child node can then be used to impact operations on the parent, such as forcing it to power on. The Red Hat Product Security team has assessed the severity of this vulnerability as Important. An authenticated project manager can reparent Volume Connectors and Volume Targets to nodes in a different project, crossing project authorization boundaries and potentially exposing iSCSI secrets used for boot-from-volume configurations. However, exploitation requires the 'manager' role, which is not a default role in OpenStack and must be explicitly granted by an administrator. The attacker must also know the UUID of the target node in the other project.
High [CVE-2026-55874] Information disclosure via S3 API gateway path traversal
SeaweedFS is a distributed storage system. Prior to 4.34, the S3 API gateway does not reject dot-dot path segments in the X-Amz-Copy-Source header used by CopyObject and UploadPartCopy, allowing an authenticated identity scoped to one bucket to read objects from other buckets through server-side copy. This issue is fixed in version 4.34. The vulnerability results in unauthorized information disclosure across storage buckets. Important: This flaw in SeaweedFS allows an authenticated attacker to bypass intended access controls within the S3 API gateway. This could lead to unauthorized information disclosure in Red Hat Cryostat deployments utilizing SeaweedFS for storage. 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-22. Affected Red Hat products: Cryostat 4. Red Hat does not currently list a fixing RHSA for this CVE.
High [CVE-2026-60002] Use-after-free vulnerability during host key re-exchange on the client side
ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchange. (This outcome occurs only on the client side.) A flaw was found in OpenSSH. This could lead to high impact on confidentiality and integrity, and low impact on availability. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L). Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.22; Red Hat Hardened Images; Red Hat Update Infrastructure 5; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8 as not affected. Red Hat fixing advisory: RHSA-2026:47757, RHSA-2026:47756, RHSA-2026:54769, RHSA-2026:37382, RHSA-2026:54387. Affected products named by the advisory: Red Hat package: openssh.
High [CVE-2026-59999] OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not. When `DisableForwarding=yes` is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over `PermitTunnel=yes`. This allows a remote attacker to bypass intended security restrictions and establish a tunnel, potentially leading to unauthorized network access or circumvention of security policies, even when forwarding is explicitly disabled. This Moderate severity flaw in OpenSSH `sshd` allows `PermitTunnel=yes` to override `DisableForwarding=yes`, potentially bypassing intended security controls. In Red Hat environments where `DisableForwarding` is used to restrict SSH session capabilities, an attacker who compromises a user's session could still establish a tunnel, leading to unauthorized network access or data exfiltration. This bypass occurs even when administrators explicitly attempt to prevent forwarding, though `PermitTunnel` is not enabled by default. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). Weakness: CWE-358. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.
High [CVE-2026-55999] glamor Font Atlas Heap Buffer Overflow
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks. A flaw was found in the glamor_font_get() function of the xorg-x11-server. This vulnerability, a heap buffer overflow, occurs when the server processes a specially crafted PCF font file where individual glyph metrics exceed the declared maximum bounds. An authenticated X client can exploit this by loading a malicious font and drawing text, potentially leading to arbitrary code execution with attacker-controlled content and extent. This affects servers utilizing the glamor acceleration backend, such as Xorg with the modesetting driver and Xwayland. This Important flaw in xorg-x11-server allows an authenticated X client to achieve arbitrary code execution. This vulnerability primarily impacts Red Hat systems running Xorg with the modesetting driver or Xwayland, typically found in desktop environments. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-805.
High [CVE-2026-56001] BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont A flaw was found in libXfont2. In the BitmapScaleBitmaps() function, an integer overflow can occur when calculating the memory needed for font glyphs. This overflow leads to a heap buffer overflow, where a smaller-than-required memory buffer is allocated. A local attacker can exploit this by loading a specially crafted PCF font, potentially leading to arbitrary code execution or a denial of service. This flaw in libXfont2 is rated as Important. A local attacker could exploit an integer overflow in the `BitmapScaleBitmaps()` function, leading to a heap buffer overflow and potential arbitrary code execution or denial of service. This vulnerability requires the processing of a specially crafted PCF font, typically through an X server or an application configured to load untrusted font files. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle 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; and 8 more.
High [CVE-2026-56002] PCF Font Parsing Heap Buffer Overflow
A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server. A flaw was found in libXfont2. A specially crafted PCF (Portable Compiled Format) font file, when processed by libXfont2, can lead to a buffer overflow. This occurs because the font parsing process does not properly validate the size of a bitmap buffer against the glyph metrics provided in the malicious font file. An attacker could exploit this vulnerability by providing a malicious font, potentially leading to arbitrary code execution or a denial of service. This is an Important flaw in libXfont2, affecting Red Hat Enterprise Linux. A heap buffer overflow during PCF font file parsing can lead to arbitrary code execution or denial of service. Exploitation requires processing a specially crafted font file, but does not necessitate rendering. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-787. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle 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; and 8 more.
High [CVE-2026-59691] rfbsrc/librfb Hextile heap out-of-bounds write with 16bpp framebuffer
A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption. This vulnerability is rated as Important severity because it is a heap out-of-bounds write reachable over the network, though exploitation requires user interaction (connecting to a malicious VNC server). The rfbsrc plugin is shipped as part of gstreamer1-plugins-bad-free in Red Hat Enterprise Linux 8, 9, 10, and Red Hat In-Vehicle Operating System (RHIVOS). A user must actively connect a GStreamer pipeline to a malicious RFB/VNC server to trigger this vulnerability. Code execution has not been demonstrated but cannot be ruled out for heap overflows. This is in the same code area as CVE-2026-52720, a few lines further down. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H). Weakness: CWE-787.
High [CVE-2026-59692] DTLS certificate Subject DN stack buffer overflow in openssl_verify_callback
A stack buffer overflow vulnerability was found in GStreamer's DTLS plugin. During a DTLS handshake, the peer certificate Subject Distinguished Name is printed into a fixed-size 2048-byte stack buffer without bounds checking. A remote unauthenticated attacker can send a certificate with an oversized Subject DN that exceeds the buffer, causing a stack buffer overflow and process crash, resulting in denial of service. This vulnerability is rated as Important severity because it is remotely triggerable without authentication or user interaction during a DTLS handshake. However, the actual impact is limited to denial of service. Remote code execution is not achievable because X509_NAME_print_ex() escapes all binary and control characters to printable ASCII sequences, preventing arbitrary byte injection into the overflow. Combined with stack canary protection (-fstack-protector-strong) in Red Hat builds, return address corruption cannot be exploited. The DTLS plugin is shipped as part of gstreamer1-plugins-bad-free in Red Hat Enterprise Linux 8, 9, 10, and RHIVOS. It is used by GStreamer WebRTC pipelines. 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-121.
High [CVE-2026-56003] computeProps Property Buffer Heap Buffer Overflow
A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H). Affected Red Hat products: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; 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; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:51061, RHSA-2026:51063, RHSA-2026:47103, RHSA-2026:51060, RHSA-2026:51066, RHSA-2026:51067, RHSA-2026:51062, RHSA-2026:51058, RHSA-2026:51059.
Medium [CVE-2026-54528] Information disclosure via case-sensitivity bypass in excluded path enforcement
JupyterLab Git is a Git extension for JupyterLab. Prior to 0.54.0, jupyterlab-git uses fnmatch.fnmatchcase() in GitHandler.prepare() in jupyterlab_git/handlers.py to enforce excluded_paths, allowing an authenticated user on a case-insensitive filesystem to vary URL path casing and read excluded directories. This issue is fixed in version 0.54.0. This vulnerability allows an authenticated user on a case-insensitive filesystem to bypass administrator-configured excluded paths by varying the case of the URL path segment. This bypass enables the user to read file content, view git status, logs, and diffs, and enumerate commits within directories that were intended to be excluded. The root cause is the unconditional case-sensitivity of the `fnmatch.fnmatchcase()` function used for path enforcement, which does not normalize paths for case-insensitive platforms. This Moderate impact flaw in JupyterLab Git, as deployed in Red Hat OpenShift AI, allows an authenticated user to bypass administrator-defined path exclusions on case-insensitive filesystems. By manipulating the casing of URL path segments, an attacker can gain unauthorized read access to sensitive Git repository information, including file content and commit history, from directories intended to be protected. This bypass occurs because the path enforcement mechanism does not account for filesystem case-insensitivity.
Medium [CVE-2026-59818] Authentication bypass due to improper Certificate Revocation List enforcement on gRPC listener
etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13. This oversight allows a client with a revoked certificate to successfully authenticate, potentially leading to unauthorized access and compromise of data integrity. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-295. Affected Red Hat products: Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-15166] Denial of Service via IEEE 802.11 protocol dissector crash
IEEE 802.11 protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service A flaw was found in Wireshark, a network protocol analyzer. An attacker could exploit this vulnerability by sending a specially crafted network packet, which would cause the IEEE 802.11 protocol dissector to crash. This issue results in a denial of service, making the Wireshark application unresponsive and unavailable to users. This Moderate impact flaw in Wireshark allows a denial of service when processing specially crafted IEEE 802.11 network packets. The vulnerability affects the availability of the Wireshark application, potentially disrupting network analysis operations, and requires an attacker to inject or present malicious 802.11 traffic to the system. Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-476. Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: wireshark.
Medium [CVE-2026-15174] Denial of Service via Catapult DCT2000 protocol dissector crash
Catapult DCT2000 protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service A flaw was found in Wireshark. A local attacker could exploit a crash in the Catapult DCT2000 protocol dissector. This vulnerability, requiring user interaction, leads to a denial of service, making the system unavailable. This flaw requires local user interaction, as an attacker must provide a specially crafted capture file for a user to open. The impact is limited to the availability of the Wireshark application, making the system unavailable only in the context of network traffic analysis. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-476. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: wireshark.
Medium [CVE-2026-15172] Denial of service via FMP/NOTIFY protocol dissector crash
FMP/NOTIFY protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service A flaw was found in Wireshark. A local user could exploit this vulnerability by processing a specially crafted FMP/NOTIFY protocol packet. This could lead to a denial of service (DoS) due to a crash in the protocol dissector, making the application unavailable. The vulnerability requires user interaction, as an attacker must trick a local user into opening a malicious packet capture file, limiting the attack surface. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-1286. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: wireshark.