FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor… (CVE-2026-66401)
FreeRDP versions before 3.29.0 contain an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser. This occurs because the parser does not properly validate the descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can exploit this flaw during camera stream setup, potentially causing a denial of service. The vulnerability has a low severity rating and a CVSS score of 2.1. No known exploits are reported in the wild. No patch information is currently provided.
AI Analysis
Technical Summary
An out-of-bounds heap read vulnerability exists in FreeRDP prior to version 3.29.0 within the UVC H.264 extension-unit parser. The vulnerability arises from failure to validate the descriptor length before accessing the GUID field, which can lead to reading beyond allocated heap memory. A local attacker controlling a malicious USB video camera can trigger this condition during the camera stream setup phase, resulting in a denial of service condition. The CVSS 3.1 base score is 2.1, reflecting low impact primarily on availability. There are no known exploits in the wild and no explicit patch or remediation details provided in the available data.
Potential Impact
The vulnerability can cause a denial of service by triggering an out-of-bounds heap read during USB video camera stream setup. It does not impact confidentiality or integrity. The attack requires local access with a malicious USB device and user interaction. The overall impact is low.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid connecting untrusted USB video cameras to systems running vulnerable FreeRDP versions. Monitor vendor communications for updates on patches or official mitigations.
FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor… (CVE-2026-66401)
Description
FreeRDP versions before 3.29.0 contain an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser. This occurs because the parser does not properly validate the descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can exploit this flaw during camera stream setup, potentially causing a denial of service. The vulnerability has a low severity rating and a CVSS score of 2.1. No known exploits are reported in the wild. No patch information is currently provided.
CVSS v3.1
Score 2.1low
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An out-of-bounds heap read vulnerability exists in FreeRDP prior to version 3.29.0 within the UVC H.264 extension-unit parser. The vulnerability arises from failure to validate the descriptor length before accessing the GUID field, which can lead to reading beyond allocated heap memory. A local attacker controlling a malicious USB video camera can trigger this condition during the camera stream setup phase, resulting in a denial of service condition. The CVSS 3.1 base score is 2.1, reflecting low impact primarily on availability. There are no known exploits in the wild and no explicit patch or remediation details provided in the available data.
Potential Impact
The vulnerability can cause a denial of service by triggering an out-of-bounds heap read during USB video camera stream setup. It does not impact confidentiality or integrity. The attack requires local access with a malicious USB device and user interaction. The overall impact is low.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid connecting untrusted USB video cameras to systems running vulnerable FreeRDP versions. Monitor vendor communications for updates on patches or official mitigations.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-j96g-x36f-4cg4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-66401"]
- Ecosystems
- []
- Database Specific Severity
- LOW
- Cvss Version
- 3.1
Threat ID: 6a6e6298bf32cb7a344f9d3d
Added to database: 08/01/2026, 21:18:16 UTC
Last enriched: 08/01/2026, 21:24:52 UTC
Last updated: 08/01/2026, 22:22:46 UTC
Views: 3
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