CVE-2026-88807: CWE-122 Heap-based buffer overflow in X.org libXrender
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.
AI Analysis
Technical Summary
This vulnerability is a heap overflow in the libXrender library used by X.org, specifically in the RenderQueryPictFormats function. It affects all versions from 0 up to but not including 0.9.13. A malicious X server could exploit this flaw to execute arbitrary code within attached X clients. The CVSS 4.0 vector indicates network attack vector with high complexity and user interaction required, but with high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could lead to arbitrary code execution in X clients connected to a malicious X server, potentially compromising client systems. The vulnerability affects confidentiality, integrity, and availability of the affected systems. There are no known active exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch links are provided, users should monitor vendor communications for updates. Until a fix is available, avoid connecting to untrusted or malicious X servers to reduce risk.
CVE-2026-88807: CWE-122 Heap-based buffer overflow in X.org libXrender
Description
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.
CVSS v4.0
Score 8.9high
Affected software
X.org
libXrender
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a heap overflow in the libXrender library used by X.org, specifically in the RenderQueryPictFormats function. It affects all versions from 0 up to but not including 0.9.13. A malicious X server could exploit this flaw to execute arbitrary code within attached X clients. The CVSS 4.0 vector indicates network attack vector with high complexity and user interaction required, but with high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could lead to arbitrary code execution in X clients connected to a malicious X server, potentially compromising client systems. The vulnerability affects confidentiality, integrity, and availability of the affected systems. There are no known active exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch links are provided, users should monitor vendor communications for updates. Until a fix is available, avoid connecting to untrusted or malicious X servers to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-09-10T08:35:07.010Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab138f455bf5e2cf5fdd955
Added to database: 09/21/2026, 14:02:28 UTC
Last enriched: 09/21/2026, 14:16:42 UTC
Last updated: 09/22/2026, 00:39:17 UTC
Views: 13
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