CVE-2026-33986

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

Affected Software

Weaknesses

• CWE-122: CWE-122: Heap-based Buffer Overflow
• CWE-131: CWE-131: Incorrect Calculation of Buffer Size

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

FreeRDP: FreeRDP: Arbitrary code execution or denial of service via H.264 codec memory allocation vulnerability

Additional References

• https://access.redhat.com/security/cve/CVE-2026-33986
• https://bugzilla.redhat.com/show_bug.cgi?id=2453221
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33986.json

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97
• https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77

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