CVE-2026-38343

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

An integer overflow in the libavfilter/vf_scale.c component of FFmpeg N-122528-gdd2976b9e1 allows attackers to cause a Denial of Service (DoS) via supplying a crafted video file.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Aug 31, 2026
No patch confirmed yet.
generic

#21587 - [Bug Report] Signed Integer Overflow @ libavfilter/vf_scale.c:653:21, vf_scale.c:661:98 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/issues/21587

Vendor Advisories for CVE-2026-38343(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:5.1.3-1 ... 7:5.1.8-0+deb12u1 (7 versions)7:5.1.9-0+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1, 7:7.1.2-0+deb13u1, 7:7.1.2-1, 7:7.1.3-0+deb13u1, 7:7.1.3-17:7.1.4-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:8.0.1-3 (8 versions)7:8.1-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 74× 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.

  1. 2026-09-21 00:11 UTCEG score recompute
  2. 2026-09-21 00:11 UTCGHSA enrichment
  3. 2026-09-20 20:15 UTCEPSS rescore
  4. 2026-09-20 01:30 UTCEG score recompute
  5. 2026-09-20 01:30 UTCGHSA enrichment
  6. 2026-09-19 02:51 UTCEG score recompute
  7. 2026-09-19 02:51 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 04:11 UTCEG score recompute
  11. 2026-09-18 04:11 UTCGHSA enrichment
  12. 2026-09-17 19:30 UTCEPSS rescore
  13. 2026-09-17 05:31 UTCEG score recompute
  14. 2026-09-17 05:31 UTCGHSA enrichment
  15. 2026-09-16 14:08 UTCEPSS rescore
  16. 2026-09-16 06:51 UTCEG score recompute
  17. 2026-09-16 06:51 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 08:11 UTCEG score recompute
  20. 2026-09-15 08:11 UTCGHSA enrichment
  21. 2026-09-15 03:11 UTCEPSS rescore
  22. 2026-09-14 09:31 UTCEG score recompute
  23. 2026-09-14 09:31 UTCGHSA enrichment
  24. 2026-09-13 16:47 UTCEPSS rescore
  25. 2026-09-13 10:51 UTCEG score recompute
Show 49 more
  1. 2026-09-13 10:51 UTCGHSA enrichment
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-12 12:10 UTCEG score recompute
  4. 2026-09-12 12:10 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 13:30 UTCEG score recompute
  7. 2026-09-11 13:30 UTCGHSA enrichment
  8. 2026-09-11 09:37 UTCEPSS rescore
  9. 2026-09-10 14:50 UTCEG score recompute
  10. 2026-09-10 14:50 UTCGHSA enrichment
  11. 2026-09-10 09:34 UTCEPSS rescore
  12. 2026-09-09 16:10 UTCGHSA enrichment
  13. 2026-09-09 04:45 UTCEG score recompute
  14. 2026-09-09 04:45 UTCGHSA enrichment
  15. 2026-09-08 22:00 UTCEPSS rescore
  16. 2026-09-08 06:05 UTCEG score recompute
  17. 2026-09-08 06:05 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-07 07:23 UTCEG score recompute
  20. 2026-09-07 07:23 UTCGHSA enrichment
  21. 2026-09-06 13:47 UTCEPSS rescore
  22. 2026-09-06 08:37 UTCEG score recompute
  23. 2026-09-06 08:37 UTCGHSA enrichment
  24. 2026-09-05 09:57 UTCEG score recompute
  25. 2026-09-05 09:57 UTCGHSA enrichment
  26. 2026-09-04 11:17 UTCEG score recompute
  27. 2026-09-04 11:17 UTCGHSA enrichment
  28. 2026-09-04 05:06 UTCEPSS rescore
  29. 2026-09-03 12:37 UTCEG score recompute
  30. 2026-09-03 12:37 UTCGHSA enrichment
  31. 2026-09-02 14:12 UTCEPSS rescore
  32. 2026-09-02 13:55 UTCGHSA enrichment
  33. 2026-09-01 15:15 UTCEG score recompute
  34. 2026-09-01 15:15 UTCGHSA enrichment
  35. 2026-09-01 13:53 UTCEPSS rescore
  36. 2026-09-01 04:39 UTCEPSS rescore
  37. 2026-08-31 16:35 UTCGHSA enrichment
  38. 2026-08-31 15:26 UTCEG score recompute▲ 6.50
  39. 2026-08-31 15:26 UTCGHSA enrichment
  40. 2026-08-31 15:24 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  41. 2026-08-31 06:18 UTCEG score recompute
  42. 2026-08-31 06:18 UTCGHSA enrichment
  43. 2026-08-30 19:17 UTCEPSS rescore
  44. 2026-08-30 01:22 UTCEPSS rescore
  45. 2026-08-28 21:41 UTCEPSS rescore
  46. 2026-08-28 00:32 UTCGHSA enrichment
  47. 2026-08-28 00:26 UTCNVD update
  48. 2026-08-27 23:24 UTCEG score recompute
  49. 2026-08-27 23:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-38343?
CVE-2026-38343 is a medium vulnerability published on August 27, 2026. An integer overflow in the libavfilter/vf_scale.c component of FFmpeg N-122528-gdd2976b9e1 allows attackers to cause a Denial of Service (DoS) via supplying a crafted video file.
When was CVE-2026-38343 disclosed?
CVE-2026-38343 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38343 actively exploited?
CVE-2026-38343 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 83.9% of all scored CVEs.
What is the CVSS score of CVE-2026-38343?
CVE-2026-38343 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38343?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38343, 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-2026-38343

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