Out-of-Bounds Read in GStreamer gst-plugins-bad package (CVE-2026-12891)
Summary
Vulnerability in GStreamer gst-plugins-bad package (CVE-2026-12891). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-12891 has been found in GStreamer gst-plugins-bad package.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "GStreamer gst-plugins-bad package CVE-2026-12891" on the vendor's site.
CVE-2026-12891 (GStreamer gst-plugins-bad package) — CWE-125 / CVSS v3 4.3
Attack vector: remote (network-reachable) / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Out-of-bounds read (CWE-125) exists in GStreamer gst-plugins-bad package.
Check the vendor advisory for the affected versions of GStreamer gst-plugins-bad package.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで GStreamer gst-plugins-bad package を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-12891 gst-plugins-bad1.0 Fixed in: 1.26.2-3+deb13u3
- Ubuntu UBUNTU-CVE-2026-12891 gst-plugins-bad1.0
References
- advisory secalert@redhat.com
- advisory secalert@redhat.com
- web secalert@redhat.com
- web nvd.nist.gov
- web github.com