What is CVE-2026-33986?

CVE-2026-33986 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-03-30.

How severe is CVE-2026-33986?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Freerdp

CVE-2026-33986

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_recall…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (15.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Freerdp — versions < 3.24.2

Weakness classification (CWE)

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97 (x_refsource_CONFIRM)
https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33986?: CVE-2026-33986 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-03-30.
How severe is CVE-2026-33986?: High severity. CVSS v3 base score is 7.5 out of 10.