What is CVE-2026-119843?

CVE-2026-119843 is a medium-severity vulnerability in Gstreamer Project Gst-Plugins-Good, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-11-03.

How severe is CVE-2026-119843?

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

Vulnerability in Gstreamer Project Gst-Plugins-Good

CVE-2026-119843

A flaw was found in GStreamer's gst-plugins-good package. The FLV media demuxer does not properly validate buffer sizes and data availability when processing enhanced audio and video tags in malformed or truncated FLV streams. A remote attacker could exploit this vulnerability by providing a specially crafted FLV media file that, when opened or streamed by a GStreamer-based application, triggers an assertion failure or a process crash, leading to denial of service.

Published 2026-11-03 · last modified 2026-11-03.

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: 0.006 (46.9th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Gstreamer Project Gst-Plugins-Good

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

Frequently asked questions

What is CVE-2026-119843?: CVE-2026-119843 is a medium-severity vulnerability in Gstreamer Project Gst-Plugins-Good, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-11-03.
How severe is CVE-2026-119843?: Medium severity. CVSS v3 base score is 6.5 out of 10.