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Vulnerability record · CVE-2026-34545 · published 1 April 2026

CVE-2026-34545: Openexr heap-based buffer overflow vulnerability

Openexr · 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.

8.4 CVSS 4.0 High EPSS 0.75% · top 47.1% CWE-122 · Heap-based buffer overflowCWE-190 · Integer overflow
8.4CVSS 4.0 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 1 tagged exploit
15 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/AcademySoftwareFoundation/openexr/commit/3827998f5c041d6a94c6af24bbb363daa669e4b3 Patch
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.7 ProductRelease Notes
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-ghfj-fx47-wg97 ExploitVendor Advisory
https://access.redhat.com/security/cve/CVE-2026-34545
https://bugzilla.redhat.com/show_bug.cgi?id=2454139
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34545.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2023-5841Openexr heap-based buffer overflow vulnerabilityDue to a failure in validating the number of scanline samples of a OpenEXR file containing deep scanline data, Academy Software Foundation OpenEX ima…EPSS 1.3%8.8CVE-2026-42216Openexr out-of-bounds read vulnerabilityOpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From…EPSS 0.71%8.8CVE-2026-41142Openexr integer overflow vulnerabilityOpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From…EPSS 0.73%8.8CVE-2021-23169Openexr out-of-bounds write vulnerabilityA heap-buffer overflow was found in the copyIntoFrameBuffer function of OpenEXR in versions before 3.0.1. An attacker could use this flaw to execute …EPSS 2.3%8.8CVE-2017-9111Openexr vulnerabilityIn OpenEXR 2.2.0, an invalid write of size 8 in the storeSSE function in ImfOptimizedPixelReading.h could cause the application to crash or execute a…EPSS 3.2%8.8CVE-2017-9113Openexr vulnerabilityIn OpenEXR 2.2.0, an invalid write of size 1 in the bufferedReadPixels function in ImfInputFile.cpp could cause the application to crash or execute a…EPSS 3.1%8.8CVE-2017-9115Openexr vulnerabilityIn OpenEXR 2.2.0, an invalid write of size 2 in the = operator function in half.h could cause the application to crash or execute arbitrary code.EPSS 3.3%8.7CVE-2026-34543Openexr use of uninitialized resource vulnerabilityOpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From…EPSS 0.52%

Source: NIST National Vulnerability Database (record CVE-2026-34545), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.