CVE-2026-66039

HIGHNVD 7.88.8▲
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-24. NVD baseline CVSS 7.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.

CVSS v3
7.8
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
24%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 7, 2026

Advisory Details (3)

Auto-updated Jul 24, 2026
No patch confirmed yet.
generic

FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-mace6-audio-decoder-heap-out-of-bounds-write-via-caf-file
generic

avcodec/mace: reject sample counts that overflow int · aafb5c655e - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/aafb5c655edc76a753275c383ebb139feb032718
generic

#23631 - avcodec/mace: reject sample counts that overflow int - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23631

Vendor Advisories for CVE-2026-66039(5)

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
ubuntulibswscale4 (7:3.4.11-0ubuntu0.1+esm13) @ bionic2026-09-18ubuntu
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm3) @ resolute2026-09-18ubuntu
redhatffmpeg-0:6.1.6-8.el9ai2026-09-10redhat
redhatrhoai/odh-vllm-gaudi-rhel9:17867124642026-09-08redhat
redhatffmpeg-0:6.1.6-7.el9ai2026-08-26redhat

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

(3)

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 28× in last 7d / 113× 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 223 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-66039?
CVE-2026-66039 is a high vulnerability published on July 24, 2026. FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytesperpacket value. Attackers can craft a CAF file with oversized bytesperpacket…
When was CVE-2026-66039 disclosed?
CVE-2026-66039 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66039 actively exploited?
CVE-2026-66039 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 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-66039?
CVE-2026-66039 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.8.
How do I remediate CVE-2026-66039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66039, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-66039

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