OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, A crafted fits stream containing consecutive 2880-byte header blocks without the mandatory end keyword makes fitsinput::read_fits_header() call itself without a depth bound. repeated recursive parsing exhausts the application stack, resulting in denial of service. The affected implementation is identified by src/fits.imageio/fitsinput.cpp, FitsInput::read_fits_header(), END keyword, and 2880-byte FITS header blocks, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
CVE-2026-59156
MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EG Risk
- 34(Track)EG Risk 34/100SSVC: 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 computedSeverity65% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 26%
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (5)
Auto-updated Sep 18, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available
v3.1.15.0
Patch available: AcademySoftwareFoundation/OpenImageIO v3.1.15.0
https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.15.0github_release Patch Available
v3.0.20.0
Patch available: AcademySoftwareFoundation/OpenImageIO v3.0.20.0
https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.20.0github_commit
commit b0de7d40d06e (AcademySoftwareFoundation/OpenImageIO)
Fix landed in AcademySoftwareFoundation/OpenImageIO commit b0de7d40d06e — awaiting tagged release
https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/b0de7d40d06eb4abc7ef14c1321a1a2a976d8c1cgithub_pr
fix(fits): Fix recursion stack overflow with too many header blocks
Fix merged in AcademySoftwareFoundation/OpenImageIO PR #5248 on 2026-06-21 — awaiting tagged release
https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5248github Patch Available🟡 PoC Available
Security Advisory: Unbounded recursion in FITS header parser leads to stack overflow · Advisory · AcademySoftwareFoundation/OpenImageIO · GitHub
https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-xvwr-x6ch-v2fqWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× 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.
- 2026-09-19 18:33 UTCEG score recompute
- 2026-09-18 16:26 UTCEG score recompute
- 2026-09-18 15:47 UTCEG score recompute
- 2026-09-18 15:44 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-59156?
CVE-2026-59156 is a medium vulnerability published on September 18, 2026. OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, A crafted fits stream containing consecutive 2880-byte header blocks without the mandatory end keyword makes…
When was CVE-2026-59156 disclosed?
CVE-2026-59156 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59156 actively exploited?
CVE-2026-59156 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 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-59156?
CVE-2026-59156 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-59156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59156, 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-2026-59156
Is Your Infrastructure Affected by CVE-2026-59156?
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