# CVE-2026-119777: Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: stack buffer overflow in h.266/vvc parser

Status: published. Published: 2026-10-30. Updated: 2026-11-03.

A flaw was found in GStreamer's gst-plugins-bad H.266/VVC parser. When processing a malformed H.266 media file or stream, an integer overflow while parsing profile, tier, and level fields can lead to a stack-based buffer overflow. An attacker could cause an application to crash and may be able to execute code in the context of the affected application.

## Remediation

- workaround: There is no complete mitigation for this vulnerability. As a risk-reduction measure, disable H.266/VVC media ingestion in GStreamer-based applications and media pipelines where that feature is not required. Until a fixed package is available, do not open or transcode H.266/VVC files or streams from untrusted sources. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- GStreamer project / gst-plugins-bad: ≥ 1.25.1; < 1.28.2 (affected, semver); 1.28.2 (unaffected). Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-02; percentile 8.20%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-119777 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2564164 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11241 (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-119777 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2564164 (secalert@redhat.com)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11241 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-119777; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119777; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119777; retrieved 2026-11-03; source updated Not reported

Revision: d75cd937f7720ed8e335361917fafb7dfc489f61ec3cc68d8b9dc8e1ca6f8461

Canonical: https://y2.dev/cve/CVE-2026-119777

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