CVE-2026-91952

Summary

FreeRDP versions before 3.31.0 contain an infinite-loop denial of service in the pool_decode_rect function when decoding AVC444 metablocks with more region rectangles than preallocated worker array size. A malicious RDP server can send crafted AVC444 graphics updates causing the threaded decode path to loop indefinitely, consuming CPU and preventing normal client operation.

Affected Software

Weaknesses

• CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m85m-3qxv-63h5
• https://www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-pool-decode-rect

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