What is CVE-2026-121601?

CVE-2026-121601 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-11-09.

How severe is CVE-2026-121601?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Out-of-bounds Read in Red Hat Enterprise Linux 10

CVE-2026-121601

A flaw was found in GStreamer's MXF demuxer plugin (gst-plugins-bad). When processing a specially crafted MXF media file, the demuxer indexes its internal delta-entry and slice-offset tables using values from the file without validating that they are within the bounds of the allocated arrays. A local attacker who tricks a user into opening a malicious MXF file can cause the application to crash (denial of service) and may be able to read limited amounts of heap memory adjacent to the affected arrays.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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-125 — Out-of-bounds Read

References

access.redhat.com/security/cve/CVE-2026-121601 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)
gstreamer.freedesktop.org/security/sa-2026-0093.html

Frequently asked questions

What is CVE-2026-121601?: CVE-2026-121601 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-11-09.
How severe is CVE-2026-121601?: Medium severity. CVSS v3 base score is 6.1 out of 10.