CVE-2026-63420Public exploit

Process crash via PSD channel-count mismatch

Published Sep 18, 2026 · Updated Sep 18, 2026

Heap out-of-bounds read in the PSD decoder in affected OpenImageIO releases allows local users to crash image-processing applications. PSDInput::read_native_scanline() supplies spec.nchannels to PSDInput::interleave_row() even when an indexed PSD with transparency metadata created fewer channel_buffers, causing indexing past the allocated array. A user must process an attacker-controlled PSD with oiio:RawColor or psd:RawData enabled; successful exploitation terminates the consuming process without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds read in the PSD decoder in affected OpenImageIO releases allows local users to crash image-processing applications. PSDInput::read_native_scanline() supplies spec.nchannels to PSDInput::interleave_row() even when an indexed PSD with transparency metadata created fewer channel_buffers, causing indexing past the allocated array. A user must process an attacker-controlled PSD with oiio:RawColor or psd:RawData enabled; successful exploitation terminates the consuming process without reported data disclosure or modification.

The record

CVE
CVE-2026-63420
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Academy Software Foundation
Product
OpenImageIO
Classifications
CWE-129, CWE-125
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.21.0
  2. Affected versionversion=>= 3.1.0.0, < 3.1.16.0
  3. Affected versionversion=>= 3.2.0.0-dev, < 3.2.0.3-beta1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenImageIOversion=< 3.0.21.0; version=>= 3.1.0.0, < 3.1.16.0; version=>= 3.2.0.0-dev, < 3.2.0.3-beta1

Published CVSS scores

5.5GitHub CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CWE-125Out-of-bounds Read

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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