CVE-2026-63420

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: 0.1%, top 97% 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
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: None knownExposed: 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 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, An indexed psd with transparency metadata creates fewer stored channel_buffers than the spec.nchannels value advertised by the rawcolor path. when oiio:rawcolor or psd:rawdata is enabled, psdinput::read_native_scanline() passes spec.nchannels to psdinput::interleave_row(), which indexes beyond channel_buffers, resulting in a heap out-of-bounds read and process crash. The affected implementation is identified by src/psd.imageio/psdinput.cpp, PSDInput::read_native_scanline(), PSDInput::interleave_row(), oiio:RawColor, psd:RawData, channel_buffers, and spec.nchannels, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
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

v3.1.16.0

Patch available: AcademySoftwareFoundation/OpenImageIO v3.1.16.0

https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0
github_release Patch Available

v3.0.21.0

Patch available: AcademySoftwareFoundation/OpenImageIO v3.0.21.0

https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.21.0
github_commit

commit 4995b25b8216 (AcademySoftwareFoundation/OpenImageIO)

Fix landed in AcademySoftwareFoundation/OpenImageIO commit 4995b25b8216 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/4995b25b8216552630e0aee0d8870e0d3aaae7ee
github_pr

fix(psd): guard row interleave bounds on corrupt data

Fix merged in AcademySoftwareFoundation/OpenImageIO PR #5307 on 2026-07-11 — awaiting tagged release

https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5307
github Patch Available🟡 PoC Available

PSD RawColor indexed image out-of-bounds read in `interleave_row` · Advisory · AcademySoftwareFoundation/OpenImageIO · GitHub

https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-x877-h4xx-5m5j

Weakness Classification(2)

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.

  1. 2026-09-19 16:54 UTCEG score recompute
  2. 2026-09-18 16:26 UTCEG score recompute
  3. 2026-09-18 15:47 UTCEG score recompute
  4. 2026-09-18 15:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-63420?
CVE-2026-63420 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 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, An indexed psd with transparency metadata creates fewer stored channelbuffers than the spec.nchannels value advertised by…
When was CVE-2026-63420 disclosed?
CVE-2026-63420 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-2026-63420 actively exploited?
CVE-2026-63420 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63420?
CVE-2026-63420 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-63420?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63420, 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

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