CVE-2026-56001: CWE-122 Heap-based buffer overflow in X.Org libXfont2
CVE-2026-56001 is a heap-based buffer overflow vulnerability in the BitmapScaleBitmaps function of libXfont2 versions prior to 2.0.8. It involves an overflowing 32-bit size value that can be exploited by an attacker with access to the X Server to execute arbitrary code within the X server context. The vulnerability has a high severity with a CVSS score of 8.5.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56001) affects libXfont2, specifically the BitmapScaleBitmaps function, due to a heap-based buffer overflow caused by an overflowing 32-bit size value. Exploitation requires local access to the X Server and could lead to arbitrary code execution within the X server context. The issue affects all libXfont2 versions prior to 2.0.8. A patch is available to address this flaw.
Potential Impact
Successful exploitation allows an attacker with access to the X Server to execute arbitrary code in the context of the X server, potentially leading to full compromise of the X server process. The CVSS score of 8.5 reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A patch is available for libXfont2 to fix this vulnerability in version 2.0.8. Users should upgrade to version 2.0.8 or later to remediate this issue. No additional vendor advisory details are provided, so check the vendor's official channels for the patch and further guidance.
CVE-2026-56001: CWE-122 Heap-based buffer overflow in X.Org libXfont2
Description
CVE-2026-56001 is a heap-based buffer overflow vulnerability in the BitmapScaleBitmaps function of libXfont2 versions prior to 2.0.8. It involves an overflowing 32-bit size value that can be exploited by an attacker with access to the X Server to execute arbitrary code within the X server context. The vulnerability has a high severity with a CVSS score of 8.5.
CVSS v3.1
Score 8.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56001) affects libXfont2, specifically the BitmapScaleBitmaps function, due to a heap-based buffer overflow caused by an overflowing 32-bit size value. Exploitation requires local access to the X Server and could lead to arbitrary code execution within the X server context. The issue affects all libXfont2 versions prior to 2.0.8. A patch is available to address this flaw.
Potential Impact
Successful exploitation allows an attacker with access to the X Server to execute arbitrary code in the context of the X server, potentially leading to full compromise of the X server process. The CVSS score of 8.5 reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A patch is available for libXfont2 to fix this vulnerability in version 2.0.8. Users should upgrade to version 2.0.8 or later to remediate this issue. No additional vendor advisory details are provided, so check the vendor's official channels for the patch and further guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-06-18T09:26:55.988Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4e14cfc9d9e3dbe3d0988a
Added to database: 07/08/2026, 09:13:51 UTC
Last enriched: 08/07/2026, 05:55:44 UTC
Last updated: 08/22/2026, 10:52:10 UTC
Views: 132
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