CVE-2026-63419Public exploitHinoki check available

Heap overwrite via mismatched IFF tile copy

Published Sep 18, 2026 · Updated Sep 18, 2026

Out-of-bounds write in affected OpenImageIO releases allows attackers to corrupt heap memory through a crafted ZBUFFER-only tiled IFF file. IffInput::read_native_tile() copies 32-bit internal pixels according to m_header.pixel_bytes() into a buffer sized from a 16-bit public ImageSpec, while a failed read leaves m_buf nonempty for a later partial-data copy. The target application must parse the file and call read_native_tile() with a correctly sized tile buffer; the overwrite can corrupt application memory.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Out-of-bounds write in affected OpenImageIO releases allows attackers to corrupt heap memory through a crafted ZBUFFER-only tiled IFF file. IffInput::read_native_tile() copies 32-bit internal pixels according to m_header.pixel_bytes() into a buffer sized from a 16-bit public ImageSpec, while a failed read leaves m_buf nonempty for a later partial-data copy. The target application must parse the file and call read_native_tile() with a correctly sized tile buffer; the overwrite can corrupt application memory.

The record

CVE
CVE-2026-63419
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Academy Software Foundation
Product
OpenImageIO
Classifications
CWE-787, T1203
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=< 3.0.21.0
  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

7.8GitHub CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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