CVE-2026-64835

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 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(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
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(8)

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

Patch Availability(7)

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
redhatrhaiis/model-opt-cuda-rhel9:17877721572026-08-31redhat
redhatrhaiis/vllm-rocm-rhel9:17878848732026-08-31redhat
redhatrhaiis/vllm-cuda-rhel9:17878605802026-08-31redhat
redhatrhoai/odh-th06-rocm64-torch291-py312-rhel9:17870764812026-08-27redhat
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 ... 7:9.0.1-1 (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(1)

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 25× in last 7d / 117× 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 254 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 02:08 UTCEG score recompute
  9. 2026-09-17 02:08 UTCVendor advisory
  10. 2026-09-17 02:08 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 11:19 UTCVendor advisory
  17. 2026-09-14 11:19 UTCGHSA enrichment
  18. 2026-09-13 22:26 UTCEG score recompute
  19. 2026-09-13 22:26 UTCVendor advisory
  20. 2026-09-13 22:26 UTCGHSA enrichment
  21. 2026-09-13 08:40 UTCVendor advisory
  22. 2026-09-13 08:40 UTCGHSA enrichment
  23. 2026-09-12 19:47 UTCEG score recompute
  24. 2026-09-12 19:47 UTCVendor advisory
  25. 2026-09-12 19:47 UTCGHSA enrichment
Show 75 more
  1. 2026-09-12 06:54 UTCVendor advisory
  2. 2026-09-12 06:53 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 21:32 UTCEG score recompute
  9. 2026-09-10 21:32 UTCVendor advisory
  10. 2026-09-10 21:32 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 21:40 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-06 08:59 UTCVendor advisory
  21. 2026-09-06 08:59 UTCGHSA enrichment
  22. 2026-09-05 20:06 UTCEG score recompute
  23. 2026-09-05 20:06 UTCVendor advisory
  24. 2026-09-05 20:06 UTCGHSA enrichment
  25. 2026-09-05 15:31 UTCEPSS rescore
  26. 2026-09-05 07:13 UTCEG score recompute
  27. 2026-09-05 07:13 UTCVendor advisory
  28. 2026-09-05 07:13 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 02:40 UTCEG score recompute
  40. 2026-08-31 02:40 UTCVendor advisory
  41. 2026-08-31 02:40 UTCGHSA enrichment
  42. 2026-08-30 19:17 UTCEPSS rescore
  43. 2026-08-30 13:46 UTCEG score recompute
  44. 2026-08-30 13:46 UTCVendor advisory
  45. 2026-08-30 13:46 UTCGHSA enrichment
  46. 2026-08-30 01:22 UTCEPSS rescore
  47. 2026-08-30 00:53 UTCEG score recompute
  48. 2026-08-30 00:53 UTCVendor advisory
  49. 2026-08-30 00:53 UTCGHSA enrichment
  50. 2026-08-28 21:42 UTCEPSS rescore
  51. 2026-08-28 01:32 UTCEG score recompute
  52. 2026-08-28 01:32 UTCVendor advisory
  53. 2026-08-28 01:32 UTCGHSA enrichment
  54. 2026-08-27 12:29 UTCVendor advisory
  55. 2026-08-27 12:29 UTCGHSA enrichment
  56. 2026-08-26 23:36 UTCEG score recompute
  57. 2026-08-26 23:36 UTCVendor advisory
  58. 2026-08-26 23:36 UTCGHSA enrichment
  59. 2026-08-26 14:47 UTCEPSS rescore
  60. 2026-08-26 10:42 UTCVendor advisory
  61. 2026-08-26 10:42 UTCGHSA enrichment
  62. 2026-08-25 20:09 UTCEG score recompute
  63. 2026-08-25 20:09 UTCVendor advisory
  64. 2026-08-25 20:09 UTCGHSA enrichment
  65. 2026-08-25 13:49 UTCEPSS rescore
  66. 2026-08-25 07:08 UTCVendor advisory
  67. 2026-08-25 07:08 UTCGHSA enrichment
  68. 2026-08-24 18:15 UTCEG score recompute
  69. 2026-08-24 18:15 UTCVendor advisory
  70. 2026-08-24 18:15 UTCGHSA enrichment
  71. 2026-08-24 04:12 UTCVendor advisory
  72. 2026-08-24 04:12 UTCGHSA enrichment
  73. 2026-08-23 15:19 UTCVendor advisory
  74. 2026-08-23 15:19 UTCGHSA enrichment
  75. 2026-08-23 02:25 UTCEG score recompute

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 73.9% 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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