CVE-2026-55059

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd 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
6.1EG
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: 0.1%CVSS: 6.1Exploit: 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. Versions prior to 3.2.10, 3.3.12 and 3.4.13 contain a heap out-of-bounds write in Imf_4_0::SampleCountChannel::set(int r, unsigned int newNumSamples[]). The row-based sample-count setter computes the target Y coordinate with dataWindow.min.x instead of dataWindow.min.y. For a valid deep image data window where min.x != min.y, a valid row index can be translated into an invalid Y coordinate, causing writes before the allocated _numSamples buffer. The vulnerability is reachable through the public OpenEXRUtil DeepImage API and can lead to heap corruption and process crashes. This issue has been fixed in versions 3.2.10, 3.3.12 and 3.4.13.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

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)
Severity61% × 45%
The EG Score, 6.1 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
0.1%
EPSS %ILE
3rd
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

October 12, 2026

Advisory Details (1)

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

OpenEXRUtil SampleCountChannel row setter heap out-of-bounds write · Advisory · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-54cp-3rq6-7mq8

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(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 48× 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 0.1% · 3rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd 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. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-10 12:26 UTCEG score recompute
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-08 03:47 UTCEG score recompute
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-07 03:05 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-06 02:43 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-03 16:29 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-02 07:40 UTCEG score recompute
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-01 07:18 UTCEG score recompute
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-09-30 06:57 UTCEG score recompute
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
Show 58 more
  1. 2026-09-28 23:22 UTCEG score recompute
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-09-27 22:35 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-09-26 22:13 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-09-25 03:21 UTCEG score recompute
  8. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-09-24 02:58 UTCEG score recompute
  10. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-09-23 02:37 UTCEG score recompute
  12. 2026-09-22 02:16 UTCEG score recompute
  13. 2026-09-21 01:54 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-09-20 01:32 UTCEG score recompute
  16. 2026-09-19 01:10 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-09-18 00:48 UTCEG score recompute
  19. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-09-17 00:27 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-09-16 00:06 UTCEG score recompute
  23. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-13 22:42 UTCEG score recompute
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  26. 2026-09-12 22:21 UTCEG score recompute
  27. 2026-09-11 21:59 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  29. 2026-09-10 21:37 UTCEG score recompute
  30. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  31. 2026-09-09 01:20 UTCEG score recompute
  32. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  33. 2026-09-07 22:34 UTCEG score recompute
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  35. 2026-09-06 22:13 UTCEG score recompute
  36. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  37. 2026-09-05 21:52 UTCEG score recompute
  38. 2026-09-04 21:30 UTCEG score recompute
  39. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-09-02 20:46 UTCEG score recompute
  41. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-09-01 19:50 UTCEG score recompute
  43. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  45. 2026-08-31 19:12 UTCEG score recompute
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-08-29 18:24 UTCEG score recompute
  48. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-27 17:37 UTCEG score recompute
  50. 2026-08-27 17:14 UTCEG score recompute
  51. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-08-27 02:02 UTCEG score recompute
  53. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  54. 2026-08-26 01:40 UTCEG score recompute
  55. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-08-25 01:19 UTCEG score recompute
  57. 2026-08-25 00:26 UTCEG score recomputeFirst assessed: 6.1 MEDIUM
  58. 2026-08-25 00:25 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55059?
CVE-2026-55059 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. Versions prior to 3.2.10, 3.3.12 and 3.4.13 contain a heap out-of-bounds write in Imf40::SampleCountChannel::set(int r, unsigned int newNumSamples[]). The row-based…
When was the CVE record for CVE-2026-55059 published?
The CVE record for CVE-2026-55059 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-2026-55059 actively exploited?
CVE-2026-55059 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55059?
CVE-2026-55059 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55059?
A fix for CVE-2026-55059 is available: update to the fixed version the vendor names in its advisory.

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