CVE-2026-64831

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-22. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and adjacent stack frames by supplying a crafted HEVC/H.265 bitstream. Attackers can embed a malicious vps_num_hrd_parameters value exceeding HEVC_MAX_SUB_LAYERS in any supported container format to overflow stack-allocated arrays in the vk_hevc_end_frame function, potentially achieving arbitrary code execution.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic

FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-stack-buffer-overflow-in-vulkan-hevc-decoder
generic

#23665 - avcodec/vulkan_hevc: reject too many VPS HRD parameter sets - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23665
generic

avcodec/vulkan_hevc: reject too many VPS HRD parameter sets · 92737390dc - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/92737390dc133daadce47dd7d2ec8ef3d9ebcbed

Vendor Advisories for CVE-2026-64831(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 28× in last 7d / 28× 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. 2026-07-28 01:31 UTCEG score recompute
  2. 2026-07-28 01:31 UTCGHSA enrichment
  3. 2026-07-27 22:53 UTCEG score recompute
  4. 2026-07-27 22:53 UTCGHSA enrichment
  5. 2026-07-27 14:14 UTCEPSS rescore
  6. 2026-07-27 12:02 UTCGHSA enrichment
  7. 2026-07-27 01:11 UTCEG score recompute
  8. 2026-07-27 01:10 UTCGHSA enrichment
  9. 2026-07-26 14:54 UTCEPSS rescore
  10. 2026-07-26 14:54 UTCEPSS rescore
  11. 2026-07-26 14:18 UTCEG score recompute
  12. 2026-07-26 14:18 UTCGHSA enrichment
  13. 2026-07-26 03:27 UTCEG score recompute
  14. 2026-07-26 03:26 UTCGHSA enrichment
  15. 2026-07-25 14:18 UTCEPSS rescore
  16. 2026-07-25 14:18 UTCEPSS rescore
  17. 2026-07-24 14:18 UTCEPSS rescore
  18. 2026-07-24 14:18 UTCEPSS rescore
  19. 2026-07-23 14:18 UTCEPSS rescore
  20. 2026-07-23 14:18 UTCEPSS rescore
  21. 2026-07-23 03:22 UTCEG score recompute
  22. 2026-07-22 21:58 UTCEG score recompute
  23. 2026-07-22 21:58 UTCGHSA enrichment
  24. 2026-07-22 21:09 UTCGHSA enrichment
  25. 2026-07-22 18:55 UTCEG score recompute
Show 3 more
  1. 2026-07-22 18:54 UTCGHSA enrichment
  2. 2026-07-22 17:02 UTCEG score recompute
  3. 2026-07-22 17:00 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-64831?
CVE-2026-64831 is a high vulnerability published on July 22, 2026. FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and adjacent stack frames by supplying a crafted HEVC/H.265 bitstream. Attackers can embed a malicious vpsnumhrdparameters…
When was CVE-2026-64831 disclosed?
CVE-2026-64831 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64831 actively exploited?
CVE-2026-64831 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 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64831?
CVE-2026-64831 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-64831?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64831, 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

Explore the affected products and dependency analysis for CVE-2026-64831

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