CVE-2026-51807

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Heap-based out-of-bounds write in j2k_precinct_subband::parse_packet_header() in OpenHTJ2K versions 0.18.3 and earlier (fixed in v0.18.4) caused by missing bounds validation before coding-pass lengths are written to j2k_codeblock::pass_length[128]. A crafted JPEG 2000 codestream containing malformed PPM packet headers can trigger a heap-based out-of-bounds write in j2k_precinct_subband::parse_packet_header() in source/core/coding/coding_units.cpp due to missing bounds validation for the j2k_codeblock::pass_length[128] array which can lead to heap corruption and process termination.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 17, 2026

Advisory Details (4)

Auto-updated Aug 29, 2026
Patch available. Sources: github_commit.
generic

Releases · osamu620/OpenHTJ2K · GitHub

https://github.com/osamu620/OpenHTJ2K/releases
generic

Comparing 0778b93...v0.18.4 · osamu620/OpenHTJ2K · GitHub

https://github.com/osamu620/OpenHTJ2K/compare/0778b93...v0.18.4
github_commit Patch Available

commit 0778b93 (osamu620/OpenHTJ2K)

Patch available: osamu620/OpenHTJ2K v0.18.4 (contains commit 0778b93)

https://github.com/osamu620/OpenHTJ2K/commit/0778b93
generic

OpenHTJ2K/CHANGELOG at main · osamu620/OpenHTJ2K · GitHub

https://github.com/osamu620/OpenHTJ2K/blob/main/CHANGELOG

Vendor Advisories for CVE-2026-51807(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 33× in last 7d / 206× 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 291 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51807?
CVE-2026-51807 is a critical vulnerability published on July 14, 2026. Heap-based out-of-bounds write in j2kprecinctsubband::parsepacketheader() in OpenHTJ2K versions 0.18.3 and earlier (fixed in v0.18.4) caused by missing bounds validation before coding-pass lengths are written to j2kcodeblock::passlength[128]. A crafted JPEG 2000 codestream containing malformed PPM…
When was CVE-2026-51807 disclosed?
CVE-2026-51807 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51807 actively exploited?
CVE-2026-51807 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 50.9% of all scored CVEs.
What is the CVSS score of CVE-2026-51807?
CVE-2026-51807 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51807?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51807, 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.

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