CVE-2026-51807

CRITICALPre-NVD 9.8Trending — 4 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

Buffer Overflow vulnerability in OpenHTJ2K v.0.18.4 and before allows an attacker to execute arbitrary code via the j2k_precinct_subband::parse_packet_header() in source/core/coding/coding_units.cpp

CVSS v3
9.8
EG Score
0.0(none)
EPSS
10.1%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (3)

Auto-updated Jul 15, 2026
Patch available. Sources: github_commit.
generic

Releases · osamu620/OpenHTJ2K · GitHub

https://github.com/osamu620/OpenHTJ2K/releases
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 6× in last 7d / 6× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 14:49 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  4. 2026-07-14 23:23 UTCNVD update
  5. 2026-07-14 22:46 UTCEG score recompute
  6. 2026-07-14 22:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51807?
CVE-2026-51807 is a critical vulnerability published on July 14, 2026. Buffer Overflow vulnerability in OpenHTJ2K v.0.18.4 and before allows an attacker to execute arbitrary code via the j2kprecinctsubband::parsepacketheader() in source/core/coding/coding_units.cpp
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 15, 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 10.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-51807

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