What is CVE-2026-121611?

CVE-2026-121611 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-457. CVSS score: 6.5/10. Published 2026-11-09.

How severe is CVE-2026-121611?

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

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-121611

A flaw was found in GStreamer's gst-plugins-bad package. A use of uninitialized memory vulnerability exists in the H.265 (HEVC) bitstream parser when processing Video Parameter Sets that declare more than one HRD (Hypothetical Reference Decoder) parameter set. A remote attacker could exploit this by providing a crafted H.265 media file or stream that, when processed by an application using GStreamer, causes unpredictable parser behavior and may crash the application. This can lead to a denial of service for any application using GStreamer to play back H.265 content.

Published 2026-11-09 · last modified 2026-11-09.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-457

References

Frequently asked questions

What is CVE-2026-121611?: CVE-2026-121611 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-457. CVSS score: 6.5/10. Published 2026-11-09.
How severe is CVE-2026-121611?: Medium severity. CVSS v3 base score is 6.5 out of 10.