CVE-2026-59982Public exploit

Crash via ILP32 DWAA buffer size truncation

Published Aug 25, 2026 · Updated Aug 25, 2026

Heap buffer overflow in OpenEXR allows attackers to crash ILP32 applications through a crafted DWAA-compressed scanline EXR file. DwaCompressor_initializeBuffers retains a size above 4 GiB in 64 bits but passes it to a 32-bit size_t allocator, producing a 248-byte buffer that libdeflate fills with up to 1 MiB. Processing the file through InputFile::readPixels on a 32-bit ILP32 build triggers heap corruption and a demonstrated crash; code execution was not proven.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap buffer overflow in OpenEXR allows attackers to crash ILP32 applications through a crafted DWAA-compressed scanline EXR file. DwaCompressor_initializeBuffers retains a size above 4 GiB in 64 bits but passes it to a 32-bit size_t allocator, producing a 248-byte buffer that libdeflate fills with up to 1 MiB. Processing the file through InputFile::readPixels on a 32-bit ILP32 build triggers heap corruption and a demonstrated crash; code execution was not proven.

The record

CVE
CVE-2026-59982
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-190, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=>= 3.1.0, < 3.2.11
  2. Affected versionversion=>= 3.3.0, < 3.3.13
  3. Affected versionversion=>= 3.4.0, < 3.4.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=>= 3.1.0, < 3.2.11; version=>= 3.3.0, < 3.3.13; version=>= 3.4.0, < 3.4.14

Published CVSS scores

5.5GitHubCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-787Out-of-bounds Write
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo