CVE-2026-12891

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2026-06-23. the CNA's CVSS baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 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(medium)
EG Risk
19(Track)
EG Risk 19/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

June 23, 2026

Last Modified

September 10, 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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-bad1.01.18.4-3 ... 1.29.2-2 (110 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-bad1.01.22.0-4 ... 1.29.2-2 (95 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-bad1.01.26.2-3, 1.26.2-3+deb13u1, 1.26.2-3+deb13u21.26.2-3+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-bad1.01.26.10-1 ... 1.28.4-1 (30 versions)1.28.5-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 48× 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.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 17:30 UTCEG score recompute
  4. 2026-09-10 17:30 UTCGHSA enrichment
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-04 05:06 UTCEPSS rescore
  9. 2026-09-02 14:11 UTCEPSS rescore
  10. 2026-09-01 13:53 UTCEPSS rescore
  11. 2026-09-01 04:39 UTCEPSS rescore
  12. 2026-08-30 20:25 UTCEG score recompute
  13. 2026-08-30 20:24 UTCGHSA enrichment
  14. 2026-08-30 19:17 UTCEPSS rescore
  15. 2026-08-30 01:21 UTCEPSS rescore
  16. 2026-08-28 21:40 UTCEPSS rescore
  17. 2026-08-27 14:24 UTCEPSS rescore
  18. 2026-08-25 13:48 UTCEPSS rescore
  19. 2026-08-24 13:53 UTCEG score recompute
  20. 2026-08-24 13:53 UTCGHSA enrichment
  21. 2026-08-23 12:49 UTCEG score recompute
  22. 2026-08-23 12:49 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 13:44 UTCEG score recompute
  25. 2026-08-22 13:44 UTCGHSA enrichment
Show 75 more
  1. 2026-08-21 23:48 UTCEPSS rescore
  2. 2026-08-21 07:19 UTCEG score recompute
  3. 2026-08-21 07:19 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 07:45 UTCEG score recompute
  6. 2026-08-20 07:45 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 04:47 UTCEG score recompute
  9. 2026-08-19 04:47 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-17 15:09 UTCEG score recompute
  12. 2026-08-17 15:09 UTCGHSA enrichment
  13. 2026-08-16 16:03 UTCEG score recompute
  14. 2026-08-16 16:03 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 16:58 UTCEG score recompute
  18. 2026-08-15 16:58 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 17:52 UTCEG score recompute
  21. 2026-08-14 17:52 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 18:39 UTCGHSA enrichment
  24. 2026-08-12 17:39 UTCEG score recompute
  25. 2026-08-12 17:39 UTCGHSA enrichment
  26. 2026-08-12 13:50 UTCEPSS rescore
  27. 2026-08-11 18:34 UTCEG score recompute
  28. 2026-08-11 18:34 UTCGHSA enrichment
  29. 2026-08-11 13:42 UTCEPSS rescore
  30. 2026-08-10 23:59 UTCEPSS rescore
  31. 2026-08-10 19:29 UTCGHSA enrichment
  32. 2026-08-09 20:24 UTCEG score recompute
  33. 2026-08-09 20:24 UTCGHSA enrichment
  34. 2026-08-09 13:46 UTCEPSS rescore
  35. 2026-08-08 21:20 UTCEG score recompute
  36. 2026-08-08 21:20 UTCGHSA enrichment
  37. 2026-08-08 16:37 UTCEPSS rescore
  38. 2026-08-07 22:15 UTCEG score recompute
  39. 2026-08-07 22:15 UTCGHSA enrichment
  40. 2026-08-06 23:11 UTCEG score recompute
  41. 2026-08-06 23:11 UTCGHSA enrichment
  42. 2026-08-06 13:46 UTCEPSS rescore
  43. 2026-08-05 23:54 UTCEG score recompute
  44. 2026-08-05 23:54 UTCGHSA enrichment
  45. 2026-08-05 19:17 UTCEPSS rescore
  46. 2026-08-05 00:50 UTCEG score recompute
  47. 2026-08-05 00:49 UTCGHSA enrichment
  48. 2026-08-04 15:09 UTCEPSS rescore
  49. 2026-08-04 10:38 UTCEPSS rescore
  50. 2026-08-04 01:30 UTCEG score recompute
  51. 2026-08-04 01:30 UTCGHSA enrichment
  52. 2026-08-03 10:35 UTCEPSS rescore
  53. 2026-08-03 02:25 UTCGHSA enrichment
  54. 2026-08-02 03:21 UTCEG score recompute
  55. 2026-08-02 03:20 UTCGHSA enrichment
  56. 2026-08-02 02:26 UTCEPSS rescore
  57. 2026-08-01 04:15 UTCEG score recompute
  58. 2026-08-01 04:15 UTCEPSS rescore
  59. 2026-08-01 04:15 UTCGHSA enrichment
  60. 2026-07-31 03:38 UTCEG score recompute
  61. 2026-07-31 03:38 UTCGHSA enrichment
  62. 2026-07-30 16:27 UTCEPSS rescore
  63. 2026-07-30 02:34 UTCEG score recompute
  64. 2026-07-30 02:34 UTCGHSA enrichment
  65. 2026-07-30 01:30 UTCEPSS rescore
  66. 2026-07-29 01:15 UTCEG score recompute
  67. 2026-07-29 01:15 UTCGHSA enrichment
  68. 2026-07-28 15:36 UTCEPSS rescore
  69. 2026-07-27 17:45 UTCEG score recompute
  70. 2026-07-27 17:45 UTCGHSA enrichment
  71. 2026-07-27 14:13 UTCEPSS rescore
  72. 2026-07-26 15:51 UTCEG score recompute
  73. 2026-07-26 15:51 UTCGHSA enrichment
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

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 September 10, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 80.6% of all scored CVEs.
What is the CVSS score of CVE-2026-12891?
CVE-2026-12891 has a CVSS v4.0 base score of 4.3 (CNA self-assessment; NVD's own analysis pending).
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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