CVE-2026-64830

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 — Patch released 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 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.

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
28%
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 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-via-vobsub-subtitle-demuxer
generic

#23657 - avformat/vobsub: reuse subtitle streams and bound the stream count - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23657
generic

avformat/vobsub: reuse subtitle streams and bound the stream count · dbd495f066 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/dbd495f066a85ba96b17433f4306582aa37c3951

Vendor Advisories for CVE-2026-64830(4)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibswscale-ffmpeg3 (7:2.8.17-0ubuntu0.1+esm17) @ xenial2026-09-18ubuntu
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm4) @ resolute2026-09-18ubuntu
redhatffmpeg-0:6.1.6-9.el9ai2026-09-14redhat
redhatrhaiis/vllm-cuda-rhel9:17878605802026-08-31redhat
redhatrhaiis/model-opt-cuda-rhel9:17877721572026-08-31redhat
redhatrhaiis/vllm-rocm-rhel9:17878848732026-08-31redhat

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 ... 7:9.0.1-1 (19 versions)——

Weakness Classification(2)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 25× in last 7d / 98× 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. 2026-09-18 22:40 UTCEG score recompute
  2. 2026-09-18 22:40 UTCVendor advisory
  3. 2026-09-18 22:40 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 03:10 UTCEG score recompute
  6. 2026-09-18 03:10 UTCVendor advisory
  7. 2026-09-18 03:10 UTCGHSA enrichment
  8. 2026-09-17 02:09 UTCEG score recompute
  9. 2026-09-17 02:09 UTCVendor advisory
  10. 2026-09-17 02:09 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 07:00 UTCEG score recompute
  13. 2026-09-16 07:00 UTCVendor advisory
  14. 2026-09-16 07:00 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-14 11:43 UTCVendor advisory
  17. 2026-09-14 11:43 UTCGHSA enrichment
  18. 2026-09-13 22:33 UTCEG score recompute
  19. 2026-09-13 22:33 UTCVendor advisory
  20. 2026-09-13 22:33 UTCGHSA enrichment
  21. 2026-09-13 09:24 UTCVendor advisory
  22. 2026-09-13 09:24 UTCGHSA enrichment
  23. 2026-09-12 20:12 UTCEG score recompute
  24. 2026-09-12 20:12 UTCVendor advisory
  25. 2026-09-12 20:12 UTCGHSA enrichment
Show 75 more
  1. 2026-09-12 07:02 UTCVendor advisory
  2. 2026-09-12 07:02 UTCGHSA enrichment
  3. 2026-09-11 17:52 UTCEG score recompute
  4. 2026-09-11 17:52 UTCVendor advisory
  5. 2026-09-11 17:52 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 09:37 UTCEPSS rescore
  8. 2026-09-10 21:33 UTCEG score recompute
  9. 2026-09-10 21:33 UTCVendor advisory
  10. 2026-09-10 21:33 UTCGHSA enrichment
  11. 2026-09-09 09:14 UTCEG score recompute
  12. 2026-09-09 09:14 UTCVendor advisory
  13. 2026-09-09 09:14 UTCGHSA enrichment
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-07 21:41 UTCEG score recompute
  16. 2026-09-07 21:41 UTCVendor advisory
  17. 2026-09-07 21:41 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-06 09:33 UTCVendor advisory
  21. 2026-09-06 09:33 UTCGHSA enrichment
  22. 2026-09-05 20:23 UTCEG score recompute
  23. 2026-09-05 20:23 UTCVendor advisory
  24. 2026-09-05 20:23 UTCGHSA enrichment
  25. 2026-09-05 15:31 UTCEPSS rescore
  26. 2026-09-05 07:14 UTCEG score recompute
  27. 2026-09-05 07:14 UTCVendor advisory
  28. 2026-09-05 07:14 UTCGHSA enrichment
  29. 2026-09-04 13:53 UTCEG score recompute
  30. 2026-09-04 13:53 UTCVendor advisory
  31. 2026-09-04 13:53 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-02 14:12 UTCEPSS rescore
  34. 2026-09-01 23:40 UTCEG score recompute
  35. 2026-09-01 23:40 UTCVendor advisory
  36. 2026-09-01 23:40 UTCGHSA enrichment
  37. 2026-09-01 13:54 UTCEPSS rescore
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-08-31 03:22 UTCEG score recompute
  40. 2026-08-31 03:22 UTCGHSA enrichment
  41. 2026-08-30 19:17 UTCEPSS rescore
  42. 2026-08-30 14:12 UTCEG score recompute
  43. 2026-08-30 14:12 UTCGHSA enrichment
  44. 2026-08-30 01:22 UTCEPSS rescore
  45. 2026-08-30 00:53 UTCEG score recompute
  46. 2026-08-30 00:53 UTCGHSA enrichment
  47. 2026-08-28 21:42 UTCEPSS rescore
  48. 2026-08-28 04:29 UTCGHSA enrichment
  49. 2026-08-27 15:04 UTCEG score recompute
  50. 2026-08-27 15:04 UTCGHSA enrichment
  51. 2026-08-27 01:54 UTCEG score recompute
  52. 2026-08-27 01:54 UTCGHSA enrichment
  53. 2026-08-26 14:47 UTCEPSS rescore
  54. 2026-08-26 12:44 UTCGHSA enrichment
  55. 2026-08-25 23:35 UTCEG score recompute
  56. 2026-08-25 23:35 UTCGHSA enrichment
  57. 2026-08-25 13:49 UTCEPSS rescore
  58. 2026-08-25 09:54 UTCGHSA enrichment
  59. 2026-08-24 20:44 UTCEG score recompute
  60. 2026-08-24 20:44 UTCGHSA enrichment
  61. 2026-08-24 07:33 UTCGHSA enrichment
  62. 2026-08-23 18:12 UTCGHSA enrichment
  63. 2026-08-23 05:03 UTCEG score recompute
  64. 2026-08-23 05:03 UTCGHSA enrichment
  65. 2026-08-23 00:19 UTCEPSS rescore
  66. 2026-08-22 15:53 UTCGHSA enrichment
  67. 2026-08-22 02:27 UTCEG score recompute
  68. 2026-08-22 02:27 UTCGHSA enrichment
  69. 2026-08-21 23:49 UTCEPSS rescore
  70. 2026-08-21 13:16 UTCGHSA enrichment
  71. 2026-08-21 00:07 UTCEG score recompute
  72. 2026-08-21 00:07 UTCGHSA enrichment
  73. 2026-08-20 22:55 UTCEPSS rescore
  74. 2026-08-20 10:56 UTCGHSA enrichment
  75. 2026-08-19 21:46 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64830?
CVE-2026-64830 is a high vulnerability published on July 22, 2026. FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in…
When was CVE-2026-64830 disclosed?
CVE-2026-64830 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-2026-64830 actively exploited?
CVE-2026-64830 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 72.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64830?
CVE-2026-64830 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64830?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64830, 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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