CVE-2026-64831

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-22. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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

A fix is available — apply it.

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(medium)
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
38%
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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm4) @ resolute2026-09-14ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:4.3.2-0+deb11u2 ... 7:8.1.2-2 (91 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:5.1.3-1 ... 7:9.0.1-1 (59 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0.1-1 (23 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:8.0.1-3 (8 versions)7:8.1-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 97× 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 209 total refreshes for this CVE.

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

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 61.9% of all scored CVEs.
What is the CVSS score of CVE-2026-64831?
CVE-2026-64831 has a CVSS v3 base score of 8.8 (NVD).
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

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