CVE-2026-50291

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 94% 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
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to versions 3.0.16.0 and 3.1.11.0, processing a crafted BMP file through oiiotool or an application linked to OpenImageIO can reach BMP palette handling in src/bmp.imageio/bmpinput.cpp with an empty color table. BmpInput::read_native_scanline then performs an invalid palette read while decoding an RLE-compressed scanline, causing a process crash and denial of service. This issue is fixed in versions 3.0.16.0 and 3.1.11.0.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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 computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 24, 2026

Advisory Details (7)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v3.1.11.0

Patch available: AcademySoftwareFoundation/OpenImageIO v3.1.11.0

https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.11.0
github_release Patch Available

v3.0.16.0

Patch available: AcademySoftwareFoundation/OpenImageIO v3.0.16.0

https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.16.0
github_commit

commit ee3370d004d5 (AcademySoftwareFoundation/OpenImageIO)

Fix landed in AcademySoftwareFoundation/OpenImageIO commit ee3370d004d5 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/ee3370d004d5895554239b4302c59eedb721f086
github_commit

commit be984856e315 (AcademySoftwareFoundation/OpenImageIO)

Fix landed in AcademySoftwareFoundation/OpenImageIO commit be984856e315 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/be984856e315e0a82cd866745b544c8c4cb8bd45
github_commit

commit 91500ed58ce9 (AcademySoftwareFoundation/OpenImageIO)

Fix landed in AcademySoftwareFoundation/OpenImageIO commit 91500ed58ce9 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/91500ed58ce927b7e710c6bbc3b7f795bb0791b5
github_pr

fix(bmp): detect corrupt files where palette doesn't match bpp

Fix merged in AcademySoftwareFoundation/OpenImageIO PR #5030 on 2026-02-07 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5030
github Patch Available🟡 PoC Available

Segmentation Fault in BmpInput::read_native_scanline (bmpinput.cpp:399) · Advisory · AcademySoftwareFoundation/OpenImageIO · GitHub

https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-q3c7-3225-66h7

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 15× 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.

  1. 2026-09-24 21:24 UTCEG score recompute
  2. 2026-09-24 20:57 UTCEG score recompute
  3. 2026-09-24 18:44 UTCEG score recompute
  4. 2026-09-23 18:28 UTCEG score recompute
  5. 2026-09-23 17:53 UTCEPSS rescore
  6. 2026-09-22 23:41 UTCEG score recompute
  7. 2026-09-21 23:26 UTCEG score recompute
  8. 2026-09-20 23:11 UTCEG score recompute
  9. 2026-09-20 20:16 UTCEPSS rescore
  10. 2026-09-19 22:54 UTCEG score recompute
  11. 2026-09-18 22:39 UTCEG score recompute
  12. 2026-09-18 19:28 UTCEPSS rescore
  13. 2026-09-17 22:24 UTCEG score recompute
  14. 2026-09-17 21:44 UTCEG score recompute
  15. 2026-09-17 21:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-50291?
CVE-2026-50291 is a medium vulnerability published on September 17, 2026. OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to versions 3.0.16.0 and 3.1.11.0, processing a crafted BMP file through oiiotool or an application linked to OpenImageIO can reach BMP palette handling in…
When was CVE-2026-50291 disclosed?
CVE-2026-50291 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50291 actively exploited?
CVE-2026-50291 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 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-50291?
CVE-2026-50291 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-50291?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50291, 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-2026-50291

Explore →

Is Your Infrastructure Affected by CVE-2026-50291?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs