CVE-2026-62986

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). 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, secondary
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses layer-prefixed RGB channels. With the default channel coalescing (separate_channels=False), the wrapper groups channels such as left.R, left.G, and left.B into a single RGB sample array, but the lane-offset calculation in PyPart::setDeepSliceData() only recognizes the exact unprefixed names G, B, and A. As a result, prefixed channels like left.G and left.B are decoded into lane 0 while lanes 1 and 2 are left uninitialized and returned to Python. A Python application that reads untrusted deep EXR files through the default OpenEXR.File API and then logs, serializes, previews, or otherwise processes the resulting NumPy sample arrays may expose uninitialized same-process heap contents, in addition to receiving incorrect green and blue channel data. This issue is fixed in versions 3.3.13 and 3.4.14.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100CISA SSVC

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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 25, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit Patch Available

commit 5a534e2228c8 (AcademySoftwareFoundation/openexr)

Patch available: AcademySoftwareFoundation/openexr v3.3.13 (contains commit 5a534e2228c8)

https://github.com/AcademySoftwareFoundation/openexr/commit/5a534e2228c853034e5cb9d2599ebf82f48f51b0
github_commit Patch Available

commit 5105809507ba (AcademySoftwareFoundation/openexr)

Patch available: AcademySoftwareFoundation/openexr v3.4.14 (contains commit 5105809507ba)

https://github.com/AcademySoftwareFoundation/openexr/commit/5105809507ba572d8cad12ec9f5a5c9d378354b9
github_commit

commit 36ff0968de08 (AcademySoftwareFoundation/openexr)

Fix landed in AcademySoftwareFoundation/openexr commit 36ff0968de08 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/openexr/commit/36ff0968de08d7ae80792f9f53402f93433207bb
githubMentions a patch (unverified)🟡 PoC Available

PyOpenEXR deep prefixed RGB stale lane disclosure · Advisory · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-pf59-r2mc-x746

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
openexr3.1.13-2, 3.4.6+ds-1, 3.4.6+ds-2, 3.4.6+ds-3, 3.4.6+ds-4
  • every version up to 3.4.14-0.1: fixed in 3.4.14-0.1
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 43× 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. 2026-10-10 11:44 UTCEG score recompute
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-08 06:49 UTCEG score recompute
  5. 2026-10-07 23:48 UTCEPSS rescore
  6. 2026-10-07 04:36 UTCEG score recompute
  7. 2026-10-06 15:18 UTCEPSS rescore
  8. 2026-10-06 02:28 UTCEG score recompute
  9. 2026-10-05 17:43 UTCEPSS rescore
  10. 2026-10-04 23:22 UTCEPSS rescore
  11. 2026-10-03 16:21 UTCEG score recompute
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-02 17:56 UTCEPSS rescore
  14. 2026-10-02 11:02 UTCEG score recompute
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-10-01 08:49 UTCEG score recompute
  17. 2026-09-30 15:03 UTCEPSS rescore
  18. 2026-09-30 06:41 UTCEG score recompute
  19. 2026-09-29 02:16 UTCEG score recompute
  20. 2026-09-28 13:51 UTCEPSS rescore
  21. 2026-09-28 00:07 UTCEG score recompute
  22. 2026-09-26 21:59 UTCEG score recompute
  23. 2026-09-26 15:59 UTCEPSS rescore
  24. 2026-09-25 04:05 UTCEG score recompute
  25. 2026-09-24 01:56 UTCEG score recompute
Show 48 more
  1. 2026-09-23 17:54 UTCEPSS rescore
  2. 2026-09-22 23:48 UTCEG score recompute
  3. 2026-09-21 21:40 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-19 17:24 UTCEG score recompute
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 15:16 UTCEG score recompute
  8. 2026-09-17 13:07 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 10:54 UTCEG score recompute
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 08:46 UTCEG score recompute
  13. 2026-09-14 06:36 UTCEG score recompute
  14. 2026-09-13 04:28 UTCEG score recompute
  15. 2026-09-12 02:19 UTCEG score recompute
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 09:37 UTCEPSS rescore
  18. 2026-09-11 00:11 UTCEG score recompute
  19. 2026-09-09 01:11 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-07 22:31 UTCEG score recompute
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 20:22 UTCEG score recompute
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-05 18:14 UTCEG score recompute
  26. 2026-09-05 15:31 UTCEPSS rescore
  27. 2026-09-04 15:54 UTCEG score recompute
  28. 2026-09-04 05:07 UTCEPSS rescore
  29. 2026-09-03 13:46 UTCEG score recompute
  30. 2026-09-02 14:12 UTCEPSS rescore
  31. 2026-09-02 11:38 UTCEG score recompute
  32. 2026-09-01 13:54 UTCEPSS rescore
  33. 2026-09-01 09:25 UTCEG score recompute
  34. 2026-09-01 04:40 UTCEPSS rescore
  35. 2026-08-31 07:16 UTCEG score recompute
  36. 2026-08-30 19:17 UTCEPSS rescore
  37. 2026-08-30 05:04 UTCEG score recompute
  38. 2026-08-30 01:22 UTCEPSS rescore
  39. 2026-08-29 02:54 UTCEG score recompute
  40. 2026-08-28 21:42 UTCEPSS rescore
  41. 2026-08-28 00:44 UTCEG score recompute
  42. 2026-08-27 14:25 UTCEPSS rescore
  43. 2026-08-26 22:32 UTCEG score recompute
  44. 2026-08-26 14:46 UTCEPSS rescore
  45. 2026-08-25 20:23 UTCEG score recompute
  46. 2026-08-25 19:20 UTCEG score recompute
  47. 2026-08-25 18:30 UTCEG score recompute
  48. 2026-08-25 18:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-62986?
CVE-2026-62986 is a medium vulnerability published on August 25, 2026. OpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses…
When was CVE-2026-62986 disclosed?
CVE-2026-62986 was first published on August 25, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62986 actively exploited?
CVE-2026-62986 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-62986?
CVE-2026-62986 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-62986?
A fix for CVE-2026-62986 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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