CVE-2026-59956Public exploitHinoki check available

Heap-data disclosure via mismatched IFF scanline stride

Published Sep 18, 2026 · Updated Sep 18, 2026

Out-of-bounds read in Academy Software Foundation OpenImageIO allows attackers to disclose heap data or crash decoders via crafted IFF files. In IffInput::readimg(), the 16-bit RGBA path allocates a temporary scanline for RGBA channels, but memcpy uses pixel_bytes(), a stride that also counts Z-buffer bytes. Processing an uncompressed 16-bit IFF file with ZBUFFER through the default IFF plugin requires user interaction and can copy adjacent heap memory into output or crash the process.

CVSS severity6.1
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds read in Academy Software Foundation OpenImageIO allows attackers to disclose heap data or crash decoders via crafted IFF files. In IffInput::readimg(), the 16-bit RGBA path allocates a temporary scanline for RGBA channels, but memcpy uses pixel_bytes(), a stride that also counts Z-buffer bytes. Processing an uncompressed 16-bit IFF file with ZBUFFER through the default IFF plugin requires user interaction and can copy adjacent heap memory into output or crash the process.

The record

CVE
CVE-2026-59956
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Academy Software Foundation
Product
OpenImageIO
Classifications
CWE-125, T1204.002
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

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Is a vulnerable build present?

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

  1. Affected versionversion=< 3.0.20.0
  2. Affected versionversion=>= 3.1.0.0, < 3.1.15.0
  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=< 3.0.20.0; version=>= 3.1.0.0, < 3.1.15.0; version=>= 3.2.0.0-dev, < 3.2.0.3-beta1

Published CVSS scores

6.1GitHub Maintainer AdvisoryCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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-125Out-of-bounds Read
T1204.002User Execution: Malicious File

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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