CVE-2026-45696

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, the HTJ2K (High-Throughput JPEG 2000) decoder, ht_undo_impl() in OpenEXRCore is vulnerable to a heap-buffer-overflow READ. The ht_undo_imp function copies decoded pixels out of a per-line OpenJPH buffer using the EXR channel's declared width as the iteration count. The codestream embedded in the EXR chunk can declare different (smaller) tile/line dimensions than the EXR header advertises, but ht_undo_impl() does not validate this — it pulls width 32-bit samples from cur_line->i32[] without checking the OpenJPH line buffer's actual length. A crafted EXR file produces a 4-byte heap-buffer-overflow READ immediately after a buffer allocated by ojph::local::codestream::finalize_alloc(). The bug is reachable through the standard scanline-decode entry point used by every consumer of exr_decoding_run/Imf::checkOpenEXRFile, including thumbnailers, asset pipelines, and the exrcheck utility — i.e. any application that opens untrusted EXR files. The result is a deterministic crash (DoS) and potential adjacent-heap leak. This issue has been fixed in version 3.4.12.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
17.8%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

OpenEXR ht_undo_impl heap-buffer-overflow READ via codestream/channel width mismatch in HTJ2K decode · Advisory · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-gjpj-qv64-vwhf
github_release Patch Available

v3.4.12

Patch available: AcademySoftwareFoundation/openexr v3.4.12

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 59× 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. 2026-07-14 04:43 UTCEG score recompute
  2. 2026-07-13 22:30 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 03:49 UTCEG score recompute
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-12 02:57 UTCEG score recompute
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-11 02:06 UTCEG score recompute
  9. 2026-07-10 01:10 UTCEG score recompute
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-08 23:26 UTCEG score recompute
  12. 2026-07-08 15:16 UTCEPSS rescore
  13. 2026-07-07 22:26 UTCEG score recompute
  14. 2026-07-07 13:46 UTCEPSS rescore
  15. 2026-07-06 21:34 UTCEG score recompute
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-05 19:16 UTCEG score recompute
  19. 2026-07-05 02:30 UTCEPSS rescore
  20. 2026-07-04 18:25 UTCEG score recompute
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-03 17:29 UTCEG score recompute
  23. 2026-07-02 16:38 UTCEG score recompute
  24. 2026-07-01 15:46 UTCEG score recompute
  25. 2026-07-01 15:07 UTCEPSS rescore
Show 34 more
  1. 2026-06-30 23:22 UTCEPSS rescore
  2. 2026-06-30 14:55 UTCEG score recompute
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-29 14:00 UTCEG score recompute
  6. 2026-06-28 14:07 UTCEPSS rescore
  7. 2026-06-28 13:09 UTCEG score recompute
  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-27 12:16 UTCEG score recompute
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 11:24 UTCEG score recompute▼ 1.80
  13. 2026-06-26 03:53 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  14. 2026-06-25 19:15 UTCEG score recompute
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-25 08:15 UTCEG score recompute
  17. 2026-06-24 21:15 UTCEG score recompute
  18. 2026-06-24 14:05 UTCEPSS rescore
  19. 2026-06-24 10:14 UTCEG score recompute
  20. 2026-06-23 23:08 UTCEG score recompute
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-23 21:33 UTCEPSS rescore
  23. 2026-06-23 12:08 UTCEG score recompute
  24. 2026-06-23 01:06 UTCEG score recompute
  25. 2026-06-22 14:05 UTCEG score recompute
  26. 2026-06-22 03:05 UTCEG score recompute
  27. 2026-06-21 15:35 UTCEG score recompute
  28. 2026-06-21 04:34 UTCEG score recompute
  29. 2026-06-20 17:31 UTCEG score recompute
  30. 2026-06-20 06:27 UTCEG score recompute
  31. 2026-06-19 19:27 UTCEG score recompute
  32. 2026-06-19 08:26 UTCEG score recompute
  33. 2026-06-18 21:23 UTCEG score recompute
  34. 2026-06-18 21:23 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45696?
CVE-2026-45696 is a medium vulnerability published on June 18, 2026. OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, the HTJ2K (High-Throughput JPEG 2000) decoder, htundoimpl() in OpenEXRCore is vulnerable to a heap-buffer-overflow READ. The htundoimp…
When was CVE-2026-45696 disclosed?
CVE-2026-45696 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45696 actively exploited?
CVE-2026-45696 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45696?
CVE-2026-45696 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-45696?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45696, 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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