Red Hat Linux Security Advisories & Vulnerabilities
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Latest Red Hat advisories
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. A flaw was found in libXfont2. This vulnerability allows an attacker to achieve arbitrary code execution or cause a Denial of Service (DoS) by providing a specially crafted Portable Compiled Format (PCF) font file. Due to missing bounds checks when processing font properties in the ComputeScaledProperties function, duplicate property entries can overflow a fixed-size heap buffer, leading to memory corruption. This vulnerability is rated as having an Important impact because a local authenticated user or X client can exploit memory corruption within processes utilizing libXfont2 to potentially execute arbitrary code or trigger a denial of service. By supplying crafted Portable Compiled Format (PCF) font data containing redundant property entries, the library writes beyond allocated buffer bounds during font property calculations. Headless servers and systems operating without active graphical display servers do not expose this functionality and are not affected. 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-787.
Medium [CVE-2026-15108] Integer overflow in Extensions API
Integer overflow in Extensions API in Google Chrome prior to 150.0.7871.115 allowed an attacker who convinced a user to install a malicious extension to perform an out of bounds memory read via a crafted Chrome Extension. (Chromium security severity: High) An integer overflow flaw was found in the Extensions API 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 5.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N). Weakness: CWE-125.
Medium [CVE-2026-15109] Uninitialized Use in ANGLE
Uninitialized Use in ANGLE in Google Chrome prior to 150.0.7871.115 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 ANGLE 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. Affected Red Hat products: 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; 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 6. Affected products named by the advisory: Red Hat package: webkitgtk4; Red Hat package: webkit2gtk3.
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 Hardened Images; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1. Red Hat fixing advisory: RHSA-2026:44868.
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.
Medium [CVE-2026-15173] Denial of Service via pcapng file parser crash
pcapng file parser crash in Wireshark 4.6.0 to 4.6.6 allows denial of service A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the pcapng file parser, leading to a crash of the application. This denial of service (DoS) could prevent legitimate users from accessing the service, impacting its availability. Exploitation requires user interaction, as the user must open the malicious file. Red Hat severity: Moderate. Weakness: CWE-825. 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-2026-15171] Denial of service via SSH protocol dissector crash
SSH 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's SSH (Secure Shell) protocol dissector. A remote attacker could craft a malicious network capture file that, when opened by a user, would cause the Wireshark application to crash. This vulnerability leads to a denial of service, preventing the user from analyzing network traffic. This issue requires user interaction to open a malicious file, limiting its impact to the availability of the Wireshark application for 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-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.
Medium [CVE-2026-15169] Denial of Service via UMTS FP protocol dissector crash
UMTS FP 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. This vulnerability allows a remote attacker to cause a denial of service (DoS) by sending a specially crafted Universal Mobile Telecommunications System (UMTS) FP protocol packet. This can disrupt network analysis operations. While exploitable by a remote attacker, successful exploitation requires a user to either open a malicious capture file or actively capture network traffic containing the crafted packet. This limits the attack surface to scenarios where Wireshark is actively used for network 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-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.
Medium [CVE-2026-15167] Denial of Service via DBS Etherwatch file parser crash
DBS Etherwatch file parser 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 remote attacker could exploit a vulnerability in the DBS Etherwatch file parser, leading to a crash of the application. This could result in a denial of service, making the Wireshark application unavailable to users. This flaw allows a remote attacker to trigger an application crash by processing a specially crafted file, impacting the availability of the network analysis tool. The vulnerability requires user interaction to open a malicious file or process untrusted network captures. 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-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.
Medium [CVE-2026-15170] Denial of service via Z39.50 protocol dissector crash
Z39.50 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 heap buffer overflow can occur when the dissector processes malformed Z39.50 records with partial directory entries, as the pre-allocated array size is calculated using floor division and does not account for additional partial entries. An attacker could exploit this by convincing a user to open a specially crafted packet capture file, causing Wireshark to crash. This flaw requires user interaction, specifically opening a specially crafted packet capture file, limiting its immediate impact on typical server deployments. 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-131. 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-2026-15165] Denial of Service via TLS ECH decryptor crash
TLS ECH decryptor crash in Wireshark 4.6.0 to 4.6.6 allows denial of service A flaw was found in Wireshark. This vulnerability allows a remote attacker to cause a denial of service by crafting a malicious TLS Encrypted Client Hello (ECH) packet. When Wireshark attempts to decrypt this malformed packet, it can lead to a crash of the application, making it unavailable. 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-617. 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-2026-15163] Denial of Service via multiple protocol dissector infinite loops
Multiple protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allow denial of service A flaw was found in Wireshark. A local user could trigger multiple protocol dissector infinite loops by providing specially crafted network traffic for analysis. This could lead to a Denial of Service (DoS) condition, making the application unresponsive. Exploitation requires a local user to open and analyze specially crafted network traffic, limiting the attack vector to interactive use cases rather than automated or remote exploitation. 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-835. 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-2026-15164] Denial of Service vulnerability in ciscodump
Crash in ciscodump 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, specifically within its `ciscodump` component. The issue can be exploited through user interaction, making the affected component unavailable. 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-2026-7492] Information disclosure of private project existence via improper authorization
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.1 before 18.11.7, 19.0 before 19.0.4, and 19.1 before 19.1.2 that under certain conditions could have allowed an unauthenticated user to determine the existence of a private project due to improper authorization controls on cross-project reference pages. A flaw was found in GitLab. This vulnerability allows an attacker to gain sensitive information about private projects. Red Hat does not ship or distribute GitLab Community Edition (CE) or Enterprise Edition (EE), the products affected by this flaw. 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-862. Red Hat lists OpenShift Pipelines; Red Hat OpenShift Container Platform 4 as not affected.
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