CVE-2026-12891

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-06-23. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
4.3
EG Score
4.3(high)
EPSS
19.4%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 1, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
Patch available. Sources: redhat.
generic

GStreamer / gstreamer · GitLab

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5109
redhat

2491318 – (CVE-2026-12891) CVE-2026-12891 gstreamer1-plugins-bad: gstreamer1-plugins-bad: global buffer overflow (OOB read) in H.266/VVC VUI parameter parser

https://bugzilla.redhat.com/show_bug.cgi?id=2491318
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12891

Vendor Advisories for CVE-2026-12891(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 11:22 UTCEG score recompute
  3. 2026-07-06 11:22 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 11:40 UTCEG score recompute
  6. 2026-07-05 11:40 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 12:29 UTCEG score recompute
  10. 2026-07-04 12:29 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 13:24 UTCEG score recompute
  13. 2026-07-03 13:24 UTCGHSA enrichment
  14. 2026-07-02 14:18 UTCEG score recompute
  15. 2026-07-02 14:18 UTCGHSA enrichment
  16. 2026-07-01 15:14 UTCEG score recompute
  17. 2026-07-01 15:14 UTCGHSA enrichment
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 16:08 UTCEG score recompute
  22. 2026-06-30 16:08 UTCGHSA enrichment
  23. 2026-06-29 17:02 UTCEG score recompute
  24. 2026-06-29 17:02 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 18 more
  1. 2026-06-28 17:56 UTCEG score recompute
  2. 2026-06-28 17:56 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-27 18:51 UTCEG score recompute
  7. 2026-06-27 18:51 UTCGHSA enrichment
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-26 19:46 UTCEG score recompute
  10. 2026-06-26 19:45 UTCGHSA enrichment
  11. 2026-06-25 20:41 UTCEG score recompute
  12. 2026-06-25 20:41 UTCGHSA enrichment
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-24 21:36 UTCEG score recompute
  15. 2026-06-24 21:35 UTCGHSA enrichment
  16. 2026-06-24 14:05 UTCEPSS rescore
  17. 2026-06-23 22:30 UTCEG score recompute
  18. 2026-06-23 22:30 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12891?
CVE-2026-12891 is a medium vulnerability published on June 23, 2026. 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…
When was CVE-2026-12891 disclosed?
CVE-2026-12891 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12891 actively exploited?
CVE-2026-12891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12891?
CVE-2026-12891 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-12891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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