CVE-2026-64835

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH 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 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change. When AV_PKT_DATA_NEW_EXTRADATA side data is received mid-stream, the adx_decode_frame function re-parses the stream header but fails to update the internal channel state, causing subsequent decoding operations to access the prev[] state array using a stale channel count.

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
26%
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 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-memory-access-in-adx-audio-decoder
generic

#23659 - avcodec/adx: sync decoder channel state on NEW_EXTRADATA - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23659
generic

avcodec/adx: sync decoder channel state on NEW_EXTRADATA · 1836ef9684 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1836ef96846937a6cc2443698a693104f5c0b21e

Vendor Advisories for CVE-2026-64835(4)

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
redhatffmpeg-0:6.1.6-3.el9ai2026-08-10redhat

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 ... 7:8.1.2-2 (57 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:8.1.2-2 (21 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:8.1.2-2 (17 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 142× 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 142 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64835?
CVE-2026-64835 is a high vulnerability published on July 22, 2026. FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change. When…
When was CVE-2026-64835 disclosed?
CVE-2026-64835 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-2026-64835 actively exploited?
CVE-2026-64835 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 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64835?
CVE-2026-64835 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64835?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64835, 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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