CVE-2026-58049

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-06-28. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

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

FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.

CVSS v3
8.6
EG Score
8.6(high)
EPSS
12.2%
KEV
Not listed

Published

June 28, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jun 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta
generic

exploitarium/ffmpeg-rasc-dlta-calc-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc
generic

FFmpeg/libavcodec/rasc.c at master · FFmpeg/FFmpeg · GitHub

https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c

Vendor Advisories for CVE-2026-58049(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 40× in last 7d / 52× 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. 2026-07-07 09:14 UTCEG score recompute
  2. 2026-07-07 09:14 UTCGHSA enrichment
  3. 2026-07-06 21:29 UTCEG score recompute
  4. 2026-07-06 21:29 UTCGHSA enrichment
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 09:45 UTCEG score recompute
  8. 2026-07-06 09:45 UTCGHSA enrichment
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 22:01 UTCEG score recompute
  12. 2026-07-05 22:01 UTCGHSA enrichment
  13. 2026-07-05 10:16 UTCEG score recompute
  14. 2026-07-05 10:16 UTCGHSA enrichment
  15. 2026-07-05 02:31 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 22:32 UTCEG score recompute
  18. 2026-07-04 22:32 UTCGHSA enrichment
  19. 2026-07-04 10:48 UTCEG score recompute
  20. 2026-07-04 10:48 UTCGHSA enrichment
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-03 23:04 UTCEG score recompute
  24. 2026-07-03 23:03 UTCGHSA enrichment
  25. 2026-07-03 11:15 UTCEG score recompute
Show 27 more
  1. 2026-07-03 11:15 UTCGHSA enrichment
  2. 2026-07-02 23:29 UTCEG score recompute
  3. 2026-07-02 23:29 UTCGHSA enrichment
  4. 2026-07-02 11:46 UTCEG score recompute
  5. 2026-07-02 11:46 UTCGHSA enrichment
  6. 2026-07-02 00:02 UTCEG score recompute
  7. 2026-07-02 00:02 UTCGHSA enrichment
  8. 2026-07-01 15:07 UTCEPSS rescore
  9. 2026-07-01 12:18 UTCEG score recompute
  10. 2026-07-01 12:18 UTCGHSA enrichment
  11. 2026-07-01 00:34 UTCEG score recompute
  12. 2026-07-01 00:34 UTCGHSA enrichment
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 12:50 UTCEG score recompute
  15. 2026-06-30 12:50 UTCGHSA enrichment
  16. 2026-06-30 01:06 UTCEG score recompute
  17. 2026-06-30 01:06 UTCGHSA enrichment
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 13:22 UTCEG score recompute
  20. 2026-06-29 13:22 UTCGHSA enrichment
  21. 2026-06-29 01:38 UTCEG score recompute
  22. 2026-06-29 01:38 UTCGHSA enrichment
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 13:54 UTCEG score recompute
  25. 2026-06-28 13:54 UTCGHSA enrichment
  26. 2026-06-28 02:10 UTCEG score recompute
  27. 2026-06-28 02:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58049?
CVE-2026-58049 is a high vulnerability published on June 28, 2026. FFmpeg's RASC video decoder (decodedlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXTLINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A…
When was CVE-2026-58049 disclosed?
CVE-2026-58049 was first published in the National Vulnerability Database on June 28, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58049 actively exploited?
CVE-2026-58049 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58049?
CVE-2026-58049 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-58049?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58049, 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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