Red Hat Security Advisory: tigervnc security update
Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients. Security Fix(es): * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999) * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001) * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003) * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of service via incorrect permissions (CVE-2026-34352) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
This advisory covers four security vulnerabilities affecting TigerVNC and the X.Org X server's xwayland component in Red Hat Enterprise Linux 8. CVE-2026-33999 is a denial of service vulnerability caused by an integer underflow in XKB compatibility map handling. CVE-2026-34001 is a use-after-free vulnerability in xwayland that can cause server crashes and potential memory corruption. CVE-2026-34003 involves information exposure and denial of service via out-of-bounds memory access in xwayland. CVE-2026-34352 affects TigerVNC's x0vncserver, allowing information disclosure, data manipulation, and denial of service due to incorrect permissions. Red Hat has released updated packages to fix these vulnerabilities in Red Hat Enterprise Linux 8.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions, server crashes, potential memory corruption, information disclosure, and unauthorized data manipulation on affected systems running TigerVNC and X.Org X server xwayland. These impacts could disrupt remote desktop services and compromise confidentiality and integrity of data handled by the affected components.
Mitigation Recommendations
Red Hat has released security updates for TigerVNC and X.Org X server xwayland in Red Hat Enterprise Linux 8 to address these vulnerabilities. Users should apply the updates as described in Red Hat advisory RHSA-2026:13414. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor beyond applying the official patches.
Red Hat Security Advisory: tigervnc security update
Description
Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients. Security Fix(es): * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999) * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001) * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003) * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of service via incorrect permissions (CVE-2026-34352) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers four security vulnerabilities affecting TigerVNC and the X.Org X server's xwayland component in Red Hat Enterprise Linux 8. CVE-2026-33999 is a denial of service vulnerability caused by an integer underflow in XKB compatibility map handling. CVE-2026-34001 is a use-after-free vulnerability in xwayland that can cause server crashes and potential memory corruption. CVE-2026-34003 involves information exposure and denial of service via out-of-bounds memory access in xwayland. CVE-2026-34352 affects TigerVNC's x0vncserver, allowing information disclosure, data manipulation, and denial of service due to incorrect permissions. Red Hat has released updated packages to fix these vulnerabilities in Red Hat Enterprise Linux 8.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions, server crashes, potential memory corruption, information disclosure, and unauthorized data manipulation on affected systems running TigerVNC and X.Org X server xwayland. These impacts could disrupt remote desktop services and compromise confidentiality and integrity of data handled by the affected components.
Mitigation Recommendations
Red Hat has released security updates for TigerVNC and X.Org X server xwayland in Red Hat Enterprise Linux 8 to address these vulnerabilities. Users should apply the updates as described in Red Hat advisory RHSA-2026:13414. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:13414
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-34001","CVE-2026-34003","CVE-2026-34352"]
- Cvss Version
- null
Threat ID: 6a160982e29bf47b5064fcce
Added to database: 05/26/2026, 20:58:42 UTC
Last enriched: 06/28/2026, 00:48:10 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 90
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