What is CVE-2026-91952?

CVE-2026-91952 is a medium-severity vulnerability in Freerdp, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-09-15.

How severe is CVE-2026-91952?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Freerdp

CVE-2026-91952

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.

Published 2026-09-15 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.3th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Freerdp

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m85m-3qxv-63h5 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-pool-d… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-91952?: CVE-2026-91952 is a medium-severity vulnerability in Freerdp, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-09-15.
How severe is CVE-2026-91952?: Medium severity. CVSS v3 base score is 6.5 out of 10.