CVE-2026-65979

MEDIUMPre-NVD 6.76.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (7th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
6.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.

CVSS v3
6.7
EG Score
6.7MEDIUMmedium confidence
EG Risk
46
EG Risk 46/100

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 (value × EchelonGraph’s weight)
Severity67% × 45%
The EG Score, 6.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 25, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 25, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Out-of-bounds read in OpenEXR HTJ2K decoder from unvalidated chunk header length (PLEN) · Advisory · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293
GitHub release Patch Available

v3.4.13

Patch available: AcademySoftwareFoundation/openexr v3.4.13

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13
GitHub commit Patch Available

commit c7af2d233b7b (AcademySoftwareFoundation/openexr)

Patch available: AcademySoftwareFoundation/openexr v3.4.13 (contains commit c7af2d233b7b)

https://github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c11f26cf47584cc2b35721

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(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-10-12 15:46 UTCEG score recompute
  4. 2026-10-11 19:31 UTCEG score recompute
  5. 2026-10-11 16:46 UTCEG score recompute
  6. 2026-10-11 14:07 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-10-10 11:43 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  11. 2026-10-09 04:09 UTCEG score recompute
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-08 02:52 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-10-06 21:58 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  17. 2026-10-05 20:53 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-10-03 16:21 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-01 07:46 UTCEG score recompute
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-09-30 06:41 UTCEG score recompute
Show 53 more
  1. 2026-09-29 00:09 UTCEG score recompute
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-09-27 23:04 UTCEG score recompute
  4. 2026-09-26 21:59 UTCEG score recompute
  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-09-25 14:40 UTCEG score recompute
  7. 2026-09-24 13:01 UTCEG score recompute
  8. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-09-23 11:55 UTCEG score recompute
  10. 2026-09-22 10:50 UTCEG score recompute
  11. 2026-09-21 09:45 UTCEG score recompute
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-09-20 08:40 UTCEG score recompute
  14. 2026-09-19 07:01 UTCEG score recompute
  15. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-18 05:56 UTCEG score recompute
  17. 2026-09-17 04:49 UTCEG score recompute
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-09-16 03:44 UTCEG score recompute
  21. 2026-09-14 01:33 UTCEG score recompute
  22. 2026-09-13 00:28 UTCEG score recompute
  23. 2026-09-11 23:23 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-09-10 22:18 UTCEG score recompute
  27. 2026-09-09 13:56 UTCEG score recompute
  28. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-09-08 12:18 UTCEG score recompute
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-07 10:24 UTCEG score recompute
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-09-06 09:18 UTCEG score recompute
  34. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-09-05 08:13 UTCEG score recompute
  36. 2026-09-04 07:08 UTCEG score recompute
  37. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-09-03 05:58 UTCEG score recompute
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-09-02 04:54 UTCEG score recompute
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-08-31 02:26 UTCEG score recompute
  44. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  45. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  46. 2026-08-29 00:15 UTCEG score recompute
  47. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-08-27 22:33 UTCEG score recompute
  49. 2026-08-26 21:28 UTCEG score recompute
  50. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-08-25 19:20 UTCEG score recompute
  52. 2026-08-25 19:10 UTCEG score recomputeFirst assessed: 6.7 MEDIUM
  53. 2026-08-25 19:09 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-65979?
CVE-2026-65979 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the…
When was the CVE record for CVE-2026-65979 published?
The CVE record for CVE-2026-65979 was published on August 25, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-65979 actively exploited?
CVE-2026-65979 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65979?
CVE-2026-65979 has a CVSS base score of 6.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-65979?
A fix for CVE-2026-65979 is available: update to the fixed version the vendor names in its advisory.

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