CVE-2026-34545: CWE-122: Heap-based Buffer Overflow in AcademySoftwareFoundation openexr
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.
AI Analysis
Technical Summary
The openexr library, used for decoding EXR image files, contains a heap-based buffer overflow vulnerability (CWE-122) in versions 3.4.0 through 3.4.6. When an attacker supplies a specially crafted .exr file with HTJ2K compression and a channel width of 32768, the library writes beyond the bounds of the output heap buffer by 2 or 4 bytes per overflow iteration for each pixel past the overflow point. This memory corruption can enable remote code execution in any application that decodes such images. The issue is addressed by an official patch in version 3.4.7.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on systems that decode maliciously crafted EXR images using vulnerable versions of openexr. This can lead to full system compromise or unauthorized control of affected applications. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade all instances of the openexr library to version 3.4.7 or later, where this heap-based buffer overflow vulnerability has been fixed. No other mitigations are indicated by the vendor advisory.
CVE-2026-34545: CWE-122: Heap-based Buffer Overflow in AcademySoftwareFoundation openexr
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The openexr library, used for decoding EXR image files, contains a heap-based buffer overflow vulnerability (CWE-122) in versions 3.4.0 through 3.4.6. When an attacker supplies a specially crafted .exr file with HTJ2K compression and a channel width of 32768, the library writes beyond the bounds of the output heap buffer by 2 or 4 bytes per overflow iteration for each pixel past the overflow point. This memory corruption can enable remote code execution in any application that decodes such images. The issue is addressed by an official patch in version 3.4.7.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on systems that decode maliciously crafted EXR images using vulnerable versions of openexr. This can lead to full system compromise or unauthorized control of affected applications. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade all instances of the openexr library to version 3.4.7 or later, where this heap-based buffer overflow vulnerability has been fixed. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-30T16:31:39.264Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69cd8944e6bfc5ba1dfc32f4
Added to database: 4/1/2026, 9:08:20 PM
Last enriched: 4/9/2026, 10:41:15 PM
Last updated: 5/17/2026, 12:38:54 AM
Views: 131
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.