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 — 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 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
27%
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(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibswscale5 (7:4.2.7-0ubuntu0.1+esm16) @ focal2026-09-14ubuntu
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm4) @ resolute2026-09-14ubuntu
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

(2)

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 23× in last 7d / 95× 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 194 total refreshes for this CVE.

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

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 72.6% 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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