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 before version 2.0.8. This overflow occurs due to an overflowing 32-bit size value. An attacker with access to the X Server could exploit this vulnerability to execute code within the X server context. The vulnerability has a high severity rating with a CVSS score of 8.5.
AI Analysis
Technical Summary
This vulnerability involves a heap buffer overflow in the BitmapScaleBitmaps function of libXfont2 prior to version 2.0.8. The overflow is caused by an unchecked 32-bit size value leading to memory corruption. Exploitation requires the attacker to have access to the X Server, potentially allowing arbitrary code execution within the X server process. No official patch or remediation level has been confirmed yet, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation could allow an attacker with access to the X Server to execute arbitrary code with the privileges of the X server process. This could lead to full compromise of the X server environment, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the X Server to trusted users only to reduce the risk of exploitation.
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 before version 2.0.8. This overflow occurs due to an overflowing 32-bit size value. An attacker with access to the X Server could exploit this vulnerability to execute code within the X server context. The vulnerability has a high severity rating 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 involves a heap buffer overflow in the BitmapScaleBitmaps function of libXfont2 prior to version 2.0.8. The overflow is caused by an unchecked 32-bit size value leading to memory corruption. Exploitation requires the attacker to have access to the X Server, potentially allowing arbitrary code execution within the X server process. No official patch or remediation level has been confirmed yet, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation could allow an attacker with access to the X Server to execute arbitrary code with the privileges of the X server process. This could lead to full compromise of the X server environment, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the X Server to trusted users only to reduce the risk of exploitation.
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: 07/08/2026, 09:28:11 UTC
Last updated: 07/08/2026, 10:13:54 UTC
Views: 8
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