CVE-2026-30754

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 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: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

A memory corruption vulnerability exists in FFmpeg before 8.1. The RTP encoding process. In the nal_send function in libavformat/rtpenc_h264_hevc.c, a negative size parameter (size=-3) is passed to memcpy when transmitting H.264/HEVC streams via RTP using a crafted input file. This was detected using AddressSanitizer.

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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

CVE-2026-30754: Buffer overflow in FFmpeg nal_send (libavformat/rtpenc_h264_hevc.c) · GitHub

https://gist.github.com/momo-trip/4cddf2c9e15600873de55259dac6b0e6
generic

GitHub - momo-trip/poc_ffmpeg · GitHub

https://github.com/momo-trip/poc_ffmpeg
generic

#20746 - avformat/rtpenc_h264_hevc: Check space for nal_length_size in ff_rtp_send_h264_hevc() - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20746

Vendor Advisories for CVE-2026-30754(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× 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. 2026-09-25 09:11 UTCGHSA enrichment
  2. 2026-09-24 21:56 UTCEG score recompute
  3. 2026-09-24 21:56 UTCGHSA enrichment
  4. 2026-09-24 10:40 UTCGHSA enrichment
  5. 2026-09-23 23:24 UTCEG score recompute
  6. 2026-09-23 23:24 UTCGHSA enrichment
  7. 2026-09-23 11:29 UTCGHSA enrichment
  8. 2026-09-23 00:13 UTCEG score recompute
  9. 2026-09-23 00:13 UTCGHSA enrichment
  10. 2026-09-22 12:58 UTCGHSA enrichment
  11. 2026-09-22 01:41 UTCEG score recompute
  12. 2026-09-22 01:41 UTCGHSA enrichment
  13. 2026-09-21 14:26 UTCGHSA enrichment
  14. 2026-09-21 03:10 UTCEG score recompute
  15. 2026-09-21 03:09 UTCGHSA enrichment
  16. 2026-09-20 20:15 UTCEPSS rescore
  17. 2026-09-20 20:15 UTCEPSS rescore
  18. 2026-09-20 15:54 UTCGHSA enrichment
  19. 2026-09-20 04:38 UTCGHSA enrichment
  20. 2026-09-19 17:23 UTCEG score recompute
  21. 2026-09-19 17:23 UTCGHSA enrichment
  22. 2026-09-19 06:07 UTCEG score recompute
  23. 2026-09-19 06:07 UTCGHSA enrichment
  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 19:27 UTCEPSS rescore
Show 49 more
  1. 2026-09-18 18:52 UTCGHSA enrichment
  2. 2026-09-18 07:36 UTCGHSA enrichment
  3. 2026-09-17 20:20 UTCEG score recompute
  4. 2026-09-17 20:20 UTCGHSA enrichment
  5. 2026-09-17 19:30 UTCEPSS rescore
  6. 2026-09-17 05:34 UTCGHSA enrichment
  7. 2026-09-16 18:18 UTCEG score recompute
  8. 2026-09-16 18:18 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 06:17 UTCEG score recompute
  11. 2026-09-16 06:17 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 19:02 UTCGHSA enrichment
  14. 2026-09-15 07:44 UTCEG score recompute
  15. 2026-09-15 07:44 UTCGHSA enrichment
  16. 2026-09-14 20:28 UTCGHSA enrichment
  17. 2026-09-14 09:06 UTCGHSA enrichment
  18. 2026-09-13 21:51 UTCEG score recompute
  19. 2026-09-13 21:51 UTCGHSA enrichment
  20. 2026-09-13 16:47 UTCEPSS rescore
  21. 2026-09-13 10:35 UTCGHSA enrichment
  22. 2026-09-12 23:20 UTCEG score recompute
  23. 2026-09-12 23:20 UTCGHSA enrichment
  24. 2026-09-12 15:01 UTCEPSS rescore
  25. 2026-09-12 12:04 UTCGHSA enrichment
  26. 2026-09-12 00:49 UTCEG score recompute
  27. 2026-09-12 00:49 UTCGHSA enrichment
  28. 2026-09-11 14:52 UTCEPSS rescore
  29. 2026-09-11 13:33 UTCEG score recompute
  30. 2026-09-11 13:33 UTCGHSA enrichment
  31. 2026-09-11 02:17 UTCGHSA enrichment
  32. 2026-09-10 15:01 UTCEG score recompute
  33. 2026-09-10 15:01 UTCGHSA enrichment
  34. 2026-09-10 09:34 UTCEPSS rescore
  35. 2026-09-10 03:45 UTCEG score recompute
  36. 2026-09-10 03:45 UTCGHSA enrichment
  37. 2026-09-09 16:30 UTCEG score recompute▲ 8.80
  38. 2026-09-09 16:29 UTCGHSA enrichment
  39. 2026-09-09 16:27 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  40. 2026-09-09 16:08 UTCEG score recompute▼ 8.80
  41. 2026-09-09 16:08 UTCGHSA enrichment
  42. 2026-09-09 16:07 UTCNVD update
  43. 2026-09-09 15:26 UTCEG score recompute▲ 8.80
  44. 2026-09-09 15:26 UTCGHSA enrichment
  45. 2026-09-09 15:24 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  46. 2026-09-08 21:53 UTCGHSA enrichment
  47. 2026-09-08 21:31 UTCNVD update
  48. 2026-09-08 20:35 UTCEG score recompute
  49. 2026-09-08 20:34 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-30754?
CVE-2026-30754 is a high vulnerability published on September 8, 2026. A memory corruption vulnerability exists in FFmpeg before 8.1. The RTP encoding process. In the nalsend function in libavformat/rtpench264_hevc.c, a negative size parameter (size=-3) is passed to memcpy when transmitting H.264/HEVC streams via RTP using a crafted input file. This was detected using…
When was CVE-2026-30754 disclosed?
CVE-2026-30754 was first published in the National Vulnerability Database on September 8, 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-2026-30754 actively exploited?
CVE-2026-30754 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.9% of all scored CVEs.
What is the CVSS score of CVE-2026-30754?
CVE-2026-30754 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-30754?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-30754, 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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