CVE-2026-58049

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-06-28. the CNA's CVSS baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 4 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

A fix is available — apply it.

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(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

June 28, 2026

Last Modified

August 19, 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(6)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatffmpeg-0:6.1.6-3.el9ai2026-08-10redhat
redhatffmpeg-0:6.1.6-1.el9ai2026-07-22redhat

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 ... 7:9.0-1 (92 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:5.1.3-1 ... 7:9.0-1 (58 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0-1 (22 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0-1 (18 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 187× 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 290 total refreshes for this CVE.

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

Related CVEs(same vendor + 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 August 19, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 80.6% of all scored CVEs.
What is the CVSS score of CVE-2026-58049?
CVE-2026-58049 has a CVSS v4.0 base score of 8.6 (CNA self-assessment; NVD's own analysis pending).
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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