A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients. (CVE-2026-88807)
A heap overflow vulnerability exists in libXrender versions before 0.9.13 within the RenderQueryPictFormats function. This flaw could allow a malicious X server to inject code into connected X clients. The vulnerability affects multiple specific older versions of libXrender. The severity is assessed as medium based on the available data.
AI Analysis
Technical Summary
CVE-2026-88807 describes a heap overflow in libXrender prior to version 0.9.13, specifically in the RenderQueryPictFormats function. This vulnerability could be exploited by a malicious X server to execute code within attached X clients. The affected versions include several builds of libXrender 0.9.8 through 0.9.12. There is no indication of known exploits in the wild. The CVSS 4.0 vector indicates network attack vector with high complexity and user interaction required, resulting in high impact on confidentiality, integrity, availability, scope, and security requirements.
Potential Impact
If exploited, this vulnerability could allow a malicious X server to execute arbitrary code within the context of connected X clients, potentially compromising their security. However, exploitation requires a malicious X server and user interaction, and the attack complexity is high. No known active exploits have been reported.
Mitigation Recommendations
A fix is available in libXrender version 0.9.13 and later. Users and administrators should upgrade to version 0.9.13 or newer to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official patch.
A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients. (CVE-2026-88807)
Description
A heap overflow vulnerability exists in libXrender versions before 0.9.13 within the RenderQueryPictFormats function. This flaw could allow a malicious X server to inject code into connected X clients. The vulnerability affects multiple specific older versions of libXrender. The severity is assessed as medium based on the available data.
CVSS v4.0
Affected software
pkg:deb/ubuntu/libxrender?arch=source&distro=trustypkg:deb/ubuntu/libxrender?arch=source&distro=esm-infra/xenialpkg:deb/ubuntu/libxrender?arch=source&distro=bionicpkg:deb/ubuntu/libxrender?arch=source&distro=focalpkg:deb/ubuntu/libxrender?arch=source&distro=jammypkg:deb/ubuntu/libxrender?arch=source&distro=noblepkg:deb/ubuntu/libxrender?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-88807 describes a heap overflow in libXrender prior to version 0.9.13, specifically in the RenderQueryPictFormats function. This vulnerability could be exploited by a malicious X server to execute code within attached X clients. The affected versions include several builds of libXrender 0.9.8 through 0.9.12. There is no indication of known exploits in the wild. The CVSS 4.0 vector indicates network attack vector with high complexity and user interaction required, resulting in high impact on confidentiality, integrity, availability, scope, and security requirements.
Potential Impact
If exploited, this vulnerability could allow a malicious X server to execute arbitrary code within the context of connected X clients, potentially compromising their security. However, exploitation requires a malicious X server and user interaction, and the attack complexity is high. No known active exploits have been reported.
Mitigation Recommendations
A fix is available in libXrender version 0.9.13 and later. Users and administrators should upgrade to version 0.9.13 or newer to remediate this vulnerability. No additional mitigation guidance is provided or required beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-88807
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab4be45f7a7c54106f047e3
Added to database: 09/24/2026, 06:08:05 UTC
Last enriched: 09/24/2026, 06:41:19 UTC
Last updated: 09/25/2026, 04:47:34 UTC
Views: 3
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