OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.
CVE-2026-59186
HIGHPre-NVD 7.17.1—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% 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, secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.1
- EG Score
- 7.1(medium)
- EG Risk
- 48(Track)EG Risk 48/100SSVC: Track
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 computedSeverity71% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 13%
- KEV
- Not listed
Published
August 25, 2026
Last Modified
August 25, 2026
Advisory Details (4)
Auto-updated Aug 25, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit Patch Available
commit b1a588737277 (AcademySoftwareFoundation/openexr)
Patch available: AcademySoftwareFoundation/openexr v3.3.13 (contains commit b1a588737277)
https://github.com/AcademySoftwareFoundation/openexr/commit/b1a5887372772d79328f4eb42b7f86352a38170bgithub_commit Patch Available
commit 904141d3a1f8 (AcademySoftwareFoundation/openexr)
Patch available: AcademySoftwareFoundation/openexr v3.2.11 (contains commit 904141d3a1f8)
https://github.com/AcademySoftwareFoundation/openexr/commit/904141d3a1f86327ad1e2b93fc92ce2dd5881d34github_commit Patch Available
commit 71907b44ce9a (AcademySoftwareFoundation/openexr)
Patch available: AcademySoftwareFoundation/openexr v3.4.14 (contains commit 71907b44ce9a)
https://github.com/AcademySoftwareFoundation/openexr/commit/71907b44ce9a1b05bf3934b8a7821752750731abgithub Patch Available🟡 PoC Available
OpenEXR ILP32 TiledRgbaInputFile large tile Array2D heap OOB write · Advisory · AcademySoftwareFoundation/openexr · GitHub
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f667-c4wm-c8gqWeakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 12× 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.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 00:15 UTCEG score recompute
- 2026-08-28 21:42 UTCEPSS rescore
- 2026-08-27 21:00 UTCEG score recompute
- 2026-08-27 14:25 UTCEPSS rescore
- 2026-08-26 20:11 UTCEG score recompute
- 2026-08-26 14:46 UTCEPSS rescore
- 2026-08-25 19:20 UTCEG score recompute
- 2026-08-25 18:30 UTCEG score recompute
- 2026-08-25 17:24 UTCEG score recompute
- 2026-08-25 16:40 UTCEG score recompute
- 2026-08-25 16:40 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-190 · CWE-787 · CWE-122
Frequently asked(5)
What is CVE-2026-59186?
CVE-2026-59186 is a high vulnerability published on August 25, 2026. OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read…
When was CVE-2026-59186 disclosed?
CVE-2026-59186 was first published in the National Vulnerability Database on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59186 actively exploited?
CVE-2026-59186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.1% of all scored CVEs.
What is the CVSS score of CVE-2026-59186?
CVE-2026-59186 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-59186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59186, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-59186
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