CVE-2026-64833

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-22. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

July 22, 2026

Last Modified

August 12, 2026

Advisory Details (3)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic

FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-c
generic

avformat/spdifenc: bound DTS core_size against the packet size in the HD path · 6f80e27654 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/6f80e2765492700622596af720534cef33dd31b4
generic

#23661 - avformat/spdifenc: bound DTS core_size against the packet size in the HD path - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23661

Vendor Advisories for CVE-2026-64833(1)

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

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 21× 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 157 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64833?
CVE-2026-64833 is a high vulnerability published on July 22, 2026. FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a coresize value larger than the actual packet length. Attackers can exploit the missing bounds…
When was CVE-2026-64833 disclosed?
CVE-2026-64833 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64833 actively exploited?
CVE-2026-64833 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 67.4% of all scored CVEs.
What is the CVSS score of CVE-2026-64833?
CVE-2026-64833 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-64833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64833, 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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