CVE-2026-55371

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (5th 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
6.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_bytes(). The public setter validates the top-level exr_attr_bytes_t value pointer but does not verify that the nested type_hint pointer is non-NULL when hint_length is greater than zero. When a caller supplies a positive hint_length together with a NULL type_hint, exr_attr_bytes_create() allocates a destination type-hint buffer and then copies from the NULL source pointer, causing a deterministic crash. The flaw is reachable through the public OpenEXRCore C API and results in a denial of service. The issue is fixed in version 3.4.13.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

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)
Severity69% × 45%
The EG Score, 6.9 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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
5th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). 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

October 12, 2026

Advisory Details (1)

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

OpenEXRCore exr_attr_set_bytes() accepts NULL type_hint with positive hint_length · Advisory · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-xx72-f24p-cf6r

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openexr3.1.13-1 ... 3.4.6+ds-4 (11 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openexr3.1.13-2 ... 3.4.6+ds-4 (7 versions)
  • every version on: no fix on record
—
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 / 54× 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% · 5th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-10-12 15:30 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-10 12:26 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-09 04:38 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-08 03:47 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-07 01:11 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-06 02:43 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-10-05 01:25 UTCEG score recompute
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-04 02:16 UTCEG score recompute
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-10-03 01:56 UTCEG score recompute
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-02 03:47 UTCEG score recompute
Show 64 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-10-01 05:37 UTCEG score recompute
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  4. 2026-09-30 06:57 UTCEG score recompute
  5. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-09-28 21:31 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-09-27 20:24 UTCEG score recompute
  9. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-09-26 22:13 UTCEG score recompute
  11. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-09-24 18:53 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-09-22 20:35 UTCEG score recompute
  15. 2026-09-21 22:23 UTCEG score recompute
  16. 2026-09-21 00:14 UTCEG score recompute
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-09-20 02:04 UTCEG score recompute
  19. 2026-09-19 03:55 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-09-18 05:45 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-09-17 07:36 UTCEG score recompute
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-09-16 09:26 UTCEG score recompute
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  27. 2026-09-15 10:16 UTCEG score recompute
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  29. 2026-09-14 12:05 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  31. 2026-09-12 15:45 UTCEG score recompute
  32. 2026-09-11 17:36 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  34. 2026-09-10 19:26 UTCEG score recompute
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-09-09 01:20 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  38. 2026-09-07 20:22 UTCEG score recompute
  39. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-09-06 22:13 UTCEG score recompute
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-09-06 00:04 UTCEG score recompute
  43. 2026-09-05 01:52 UTCEG score recompute
  44. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  45. 2026-09-02 07:17 UTCEG score recompute
  46. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-09-01 09:07 UTCEG score recompute
  48. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-31 10:52 UTCEG score recompute
  50. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-08-30 12:42 UTCEG score recompute
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  53. 2026-08-29 14:33 UTCEG score recompute
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  55. 2026-08-27 18:12 UTCEG score recompute
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-08-26 18:37 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-08-25 20:24 UTCEG score recompute
  60. 2026-08-25 19:37 UTCEG score recompute
  61. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  62. 2026-08-25 01:19 UTCEG score recompute
  63. 2026-08-25 00:45 UTCEG score recomputeFirst assessed: 6.9 MEDIUM
  64. 2026-08-25 00:45 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55371?
CVE-2026-55371 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exrattrsetbytes(). The public setter validates the…
When was the CVE record for CVE-2026-55371 published?
The CVE record for CVE-2026-55371 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 October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-55371 actively exploited?
CVE-2026-55371 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55371?
CVE-2026-55371 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55371?
A fix for CVE-2026-55371 is available: update to the fixed version the vendor names in its advisory.

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