Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
Medium [CVE-2026-47086] Information disclosure via URLAUTH token bypass of Access Control Lists
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions. This allows bypassing Access Control Lists (ACLs), which are rules that control access to mailboxes. Consequently, an attacker could read mail from any mailbox, even without having been granted explicit read permissions. This flaw in cyrus-imapd allows an authenticated attacker to bypass Access Control Lists (ACLs) by minting a URLAUTH token via the GENURLAUTH command. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-639. 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: cyrus-imapd.
Medium [CVE-2026-56434] Heap buffer over-read allows memory modification or denial of service
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. A vulnerability in NGINX's ngx_http_ssi_module allows an unauthenticated MITM attacker to trigger a heap buffer over-read by manipulating upstream server responses. This requires SSI, proxy_pass, and proxy_buffering off to be configured, and can result in memory modification or a Denial of Service (DoS). This Moderate severity vulnerability in NGINX affects configurations utilizing the `ngx_http_ssi_module` alongside `proxy_pass` and `proxy_buffering off`. The specific combination of directives and an active MITM position limits the overall impact. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H). Weakness: CWE-125.
Medium [CVE-2026-15779] pam_winbind mkhomedir chowns critical system paths without validation
A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation. Red Hat Product Security rates this flaw's impact as Moderate. Exploitation requires mkhomedir to be explicitly enabled in pam_winbind.conf, a non-default option used specifically in Active Directory domain-integration deployments, and a PAM session to be opened for an account whose home directory resolves to /. While the most direct trigger is root running su to such an account, a non-root user holding a narrow sudo delegation to run a command as that account can reach the same code path. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 2 more.
Medium [CVE-2026-15812] access control list bypass via link ID spoofing on unencrypted dynamic links
A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network traffic from any IP address) without network payload encryption, the validation architecture implicitly trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer, potentially leading to data corruption or service instabilities. Red Hat Product Security rates this vulnerability's impact as Low. Although the vulnerability allows an unauthenticated remote attacker to completely bypass the internal ACL layer and introduce arbitrary traffic, it depends entirely on a non-production configuration. The exploit requires that kronosnet actively accept connections from any arbitrary IP (dynamic links) while simultaneously running completely unencrypted traffic. Furthermore, this issue does not affect Red Hat Enterprise Linux High Availability (RHEL HA) or any official layered products, as Red Hat configurations securely enable network encryption by default, entirely mitigating the vulnerability's attack prerequisites.
Medium [CVE-2026-15811] encryption key exposure in memory after cryptographic configuration changes
A vulnerability was found in kronosnet's (version <=1.34) cryptographic configuration management. The framework does not correctly zero-out or wipe sensitive memory segments after executing changes to its cryptographic configuration. This omission leaves raw encryption keys resident in memory after the associated structures are freed. A local attacker capable of leveraging memory disclosure techniques could exploit this flaw to retrieve the active encryption key, allowing them to decrypt cluster network communications or inject malicious packets to cause severe high-availability cluster instability. Red Hat Product Security rates this flaw's impact as Moderate. While kronosnet is a critical core networking component within the Red Hat Enterprise Linux High Availability (RHEL HA) ecosystem, exploiting this vulnerability requires a high degree of complexity. An attacker must already possess local access to the host machine and successfully pair this flaw with a distinct memory disclosure mechanism to extract the key fragments post-free(). Red Hat severity: Low — CVSS 5.8 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L). Weakness: CWE-212. 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. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-38755] Denial of Service via heap overflow in evalcommand function
A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input. A flaw was found in Busybox. This can lead to the unavailability of the service. The vulnerability requires an attacker to supply specially crafted input, which typically implies existing local access or specific application interactions within the Busybox environment, thus limiting the direct exposure. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-120. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:42074. Affected products named by the advisory: Red Hat package: busybox.
Medium [CVE-2026-38752] Denial of Service via crafted AWK script
A stack overflow in the evaluate() function (editors/awk.c) of BusyBox commit 371fe9 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script. A flaw was found in BusyBox. A Denial of Service attack can make the affected system or application unavailable to legitimate users. An attacker could provide a specially crafted AWK script, leading to a stack overflow and making the BusyBox instance unresponsive. This vulnerability primarily affects systems where BusyBox is configured to execute untrusted AWK scripts, limiting its broader impact. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-120. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:42074. Affected products named by the advisory: Red Hat package: busybox.
Medium [CVE-2026-59732] File overwrite via path traversal during archive extraction
Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, rclone archive extract can write extracted files outside the user-selected destination prefix when extracting a crafted archive containing parent path components such as../, allowing creation or overwrite of sibling objects in the same bucket or path scope. This issue is fixed in version 1.74.4. An attacker could craft a malicious archive that, when extracted by a user, allows files to be written outside the intended destination directory. This path traversal vulnerability could lead to the creation or overwrite of other files within the same storage location, potentially compromising data integrity. Red Hat ships rclone in the VolSync component of Red Hat Advanced Cluster Management for Kubernetes (RHACM). All shipped versions are affected by this path traversal vulnerability in rclone's archive extraction functionality. Exploitation requires a user to actively run `rclone archive extract` on an attacker-supplied malicious archive. Red Hat severity: Moderate — CVSS 5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L). Weakness: CWE-22. Red Hat lists Red Hat Advanced Cluster Management for Kubernetes 2 as not affected.
Medium [CVE-2026-48125] Denial of Service via crafted Client Hints header
UAParser.js is a JavaScript library to detect browsers, operating systems, CPUs, and devices from user-agent data. From 2.0.1 until 2.0.10, a regular expression denial-of-service vulnerability exists when using the Client Hints API. By sending a crafted Sec-CH-UA-Model header to an application that calls UAParser(headers).withClientHints(), an attacker can cause excessive CPU time due to catastrophic backtracking in the device regex because Client Hints values are copied without the UA_MAX_LENGTH limit used for User-Agent values. This issue is fixed in version 2.0.10. A flaw was found in UAParser.js, a JavaScript library for detecting client information. This can cause excessive CPU usage due to a regular expression denial-of-service (ReDoS) issue, leading to a denial of service for the affected application. Mobile browsers send this hint to inform servers about the specific device model. Servers use the model name to tailor content, apply device-specific optimizations, or log analytics about which hardware models access a service. A single request with a ~32,000-character model value can consume over 400ms of CPU time, with parsing time growing polynomially with input length. The impact is availability only, there is no confidentiality or integrity impact. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-1333.
Medium [CVE-2026-49476] Denial of Service via crafted CSS selector string
Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup.select() /.select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4. An uncontrolled resource consumption vulnerability was found in the soupsieve Python package, a CSS selector library used by BeautifulSoup4. A remote attacker could provide a crafted CSS selector string that causes excessive memory or CPU consumption, leading to a denial of service condition. It requires the application to accept untrusted CSS selectors supplied in one of the following sinks: * soupsieve.compile() * BeautifulSoup.select() * BeautifulSoup.select_one() This is an uncommon scenario. Red Hat severity: Important — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected products named by the advisory: Red Hat Hardened Images; Red Hat OpenShift AI 3.4; Exploit Intelligence; Lightspeed Core; and 9 more.
Medium [CVE-2026-49854] Information disclosure via out-of-bounds read in websocket_mask
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6. This allowed the C function to read beyond the intended buffer, potentially exposing up to three bytes of uninitialized memory. This vulnerability can be triggered when the native extension is active and Tornado's Cross-Site Request Forgery (XSRF) token decoder is in use, leading to information disclosure. This Moderate vulnerability in the Tornado web framework's optional native extension, `tornado.speedups`, could lead to information disclosure. When the native extension is active and the XSRF token decoder is in use, an out-of-bounds read of up to three bytes of uninitialized memory may occur. This limited data exposure is contingent on specific configurations and does not directly lead to broader system compromise. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-125.
Medium [CVE-2026-15778] Insufficient validation of untrusted input in Navigation
Insufficient validation of untrusted input in Navigation in Google Chrome prior to 150.0.7871.125 allowed a remote attacker who had compromised the renderer process to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Medium) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 4.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N). Weakness: CWE-1289.
Medium [CVE-2026-15771] Insufficient validation of untrusted input in Media
Insufficient validation of untrusted input in Media in Google Chrome on Windows prior to 150.0.7871.125 allowed a remote attacker who had compromised the renderer process to obtain potentially sensitive information from process memory via a crafted HTML page. (Chromium security severity: High) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Important — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N). Weakness: CWE-125.
Medium [CVE-2026-15770] Uninitialized Use in V8
Uninitialized Use in V8 in Google Chrome prior to 150.0.7871.125 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page. (Chromium security severity: High) An uninitialized use flaw was found in the V8 component of the Chromium browser. Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Important — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Weakness: CWE-824.
Medium [CVE-2026-49459] Cross-site scripting bypass allows arbitrary script execution
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could preserve event-handler attributes on an attacker-controlled root when a descendant name clobbered properties checked by _isClobbered, because _forceRemove no-opped on the parent-less root and _sanitizeAttributes returned early. This issue is fixed in version 3.4.6. A remote attacker could exploit a vulnerability in the `DOMPurify.sanitize` function when used with the `IN_PLACE: true` option. Successful exploitation could lead to the execution of arbitrary scripts in the user's browser, potentially compromising user data or session integrity. Successful exploitation requires a specific application configuration where untrusted HTML is processed in this manner, allowing malicious event handlers to persist and execute arbitrary scripts. Red Hat products are generally not affected by default configurations, as this specific usage pattern is uncommon. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-79. Affected products named by the advisory: Migration Toolkit for Virtualization; Multicluster Engine for Kubernetes; Node HealthCheck Operator; OpenShift Lightspeed; and 17 more.
Medium [CVE-2026-49458] Cross-site scripting due to improper sanitization of DOM nodes
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6. When processing certain types of web page elements, DOMPurify failed to properly identify and sanitize malicious code. This oversight could allow an attacker to inject and execute harmful scripts within a user's web browser, potentially leading to information disclosure or unauthorized actions. This Moderate cross-site scripting (XSS) flaw in DOMPurify arises when the `DOMPurify.sanitize()` function is used with the `IN_PLACE: true` option on DOM nodes originating from a different realm (e.g., an iframe). This misconfiguration bypasses critical sanitization checks, allowing executable markup to persist. Red Hat products utilizing DOMPurify in this specific manner could be vulnerable to information disclosure or unauthorized actions if processing untrusted content. Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-79.
Medium [CVE-2026-47423] Cross-site scripting vulnerability allows information disclosure
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside is returned. This issue is fixed in version 3.4.5. Due to the default allowance of `selectedcontent`, a remote attacker could craft a malicious payload that, after initial sanitization, could be re-cloned by browsers, leading to the execution of unsanitized markup. This could result in information disclosure. User interaction is required for exploitation. * AC was raised from Low to High because exploitation requires specific browser support for the experimental HTML element, which is currently only available in Chromium 148+ and WebKit 625+. No Red Hat product ships dompurify 3.4.4. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N). Weakness: CWE-79. Affected Red Hat products: Red Hat Hardened Images; Red Hat Ceph Storage 9; Red Hat Openshift Data Foundation 4.
Medium [CVE-2026-15714] Out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata. This vulnerability presents a moderate risk to confidentiality and availability for software implementations implementing libsoup for multipart payload handling. Because the memory tracking misalignment happens during the automated header ingestion phase, an attacker can seamlessly induce a crash remotely without needing local context or user interaction. Red Hat Product Security ranks this as a notable security regression within parsing utilities, though impact vectors generally manifest as localized client or server session instability rather than complete remote code execution. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L). Weakness: CWE-125.
Medium [CVE-2026-15713] HTTP/2 frame window exhaustion remote denial of service via memory leak
A vulnerability was found in libsoup's HTTP/2 protocol implementation. The library fails to correctly release memory context blocks under specific stream termination conditions, such as when an HTTP/2 connection encounters window exhaustion or explicit stream resets. A remote, unauthenticated attacker acting as a malicious network peer can trick the connection engine into allocating stream states that are subsequently leaked during cleanup. Over a sustained period, this flaw allows the remote attacker to consume the system's heap allocations incrementally, triggering a denial of service (DoS) through an ultimate Out-of-Memory (OOM) application crash. This flaw poses a moderate availability impact to applications leveraging libsoup for modern HTTP/2 communications. Because the memory leakage accrues iteratively over standard session handling paths, an attacker can reliably cause a service disruption without needing local system privileges or user interaction. Red Hat Product Security notes that while the impact is bounded to a local application process termination, it remains a severe reliability risk for persistent cloud daemons or desktop clients communicating over untrusted wide-area network nodes. Red Hat severity: Low — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-772.
Medium [CVE-2026-50659] .NET:.NET: Network Spoofing Vulnerability
Improper encoding or escaping of output in.NET allows an authorized attacker to perform spoofing over a network. A flaw was found in.NET. This allows the attacker to perform spoofing over a network, potentially deceiving users or systems into believing they are interacting with a trusted entity. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N). Weakness: CWE-838. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Hardened Images. Red Hat lists Red Hat OpenShift Dev Spaces as not affected. Red Hat fixing advisory: RHSA-2026:41893, RHSA-2026:41895, RHSA-2026:41897, RHSA-2026:58566, RHSA-2026:58567, RHSA-2026:41899, RHSA-2026:41900, RHSA-2026:41901, RHSA-2026:41894, RHSA-2026:41896, RHSA-2026:41898, RHSA-2026:58568, RHSA-2026:58569, RHSA-2026:58570, RHSA-2026:26638, RHSA-2026:39952, RHSA-2026:42145. Affected products named by the advisory: Red Hat package: dotnet8.0; Red Hat package: dotnet9.0; Red Hat package: dotnet10.0.