# CVE-2026-86476: Gstreamer1-plugins-base: gst-plugins-base: heap buffer overflow via unvalidated gstvideometa plane extents in gst_video_frame_map_id and video_meta_deserialize

Status: published. Published: 2026-10-14. Updated: 2026-11-04.

A flaw was found in gst-plugins-base. A heap buffer overflow can be triggered when processing video buffers whose attached GstVideoMeta metadata declares plane strides and offsets that exceed the actual backing memory allocation. The metadata is not range-checked during deserialization, and the video frame mapping code does not verify that the declared plane geometry fits within the buffer before allowing consumers to read or write video data. A local attacker who controls the sending side of a GStreamer inter-process IPC pipeline can deliver a crafted buffer carrying fabricated strides, causing the receiving process to read or write beyond heap boundaries. Successful exploitation can cause a denial of service or potentially allow code execution within the affected process.

## Remediation

- workaround: If inter-process video sharing via unixfd is not required, build or deploy GStreamer without the unixfd plugin (for example meson option -Dgst-plugins-bad:unixfd=disabled, or omit libgstunixfd.so from the GStreamer plugin directory). Upstream confirms this is the only practical mitigation for the cross-process attack path and notes the unixfd plugin is not currently used by Red Hat-packaged or major distribution software. Operational policy to avoid connecting receiver pipelines to Unix socket endpoints controlled by untrusted local processes provides equivalent protection without rebuilding. This does not address the underlying validation gap in libgstvideo when attacker-controlled GstVideoMeta is supplied in-process. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1-plugins-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gstreamer-plugins-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer1-plugins-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer-plugins-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1-plugins-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1-plugins-base): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.4 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-04; percentile 9.14%

- 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-2026-86476 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2529510 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://redhat.atlassian.net/browse/PSIRTSUPT-23320 (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-86476; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-86476; retrieved 2026-11-05; source updated Not reported

Revision: 610bedb900291434668dba95393d2bf6fe009af15d67e055149d0fcf93c3beff

Canonical: https://y2.dev/cve/CVE-2026-86476

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