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Public proof of conceptFix available

CVE-2026-34545

A public proof of concept exists; no exploitation attested.

  • Published2026-04-01
  • Fixed in3.4.7
  • WeaknessCWE-122 · CWE-1284 · CWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-0121:17CVE publishedNVD

Versions per branch

NVD
Openexr
BranchAffectedFixed in
3.4≥ 3.4.0, < 3.4.73.4.7

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • AcademySoftwareFoundation openexr
    Affected
    • = >= 3.4.0, < 3.4.7no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-01

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openexrWolfiall versions · fixed in 3.4.9-r0and 7 other packages
  • openexrUbuntu:26.10all versions · no fixed version listed
  • openexrRoot:Debian:13all versions · fixed in 3.1.13-2.aikido.14and 1 other package
  • openexrRoot:Debian:13all versions · fixed in 3.1.13-2.aikido.15and 1 other package
  • openexrRoot:Debian:13all versions · fixed in 3.1.13-2.root.io.11and 1 other package
  • openexrRoot:Debian:13all versions · fixed in 3.1.13-2.root.io.12and 1 other package
  • openexrRoot:Debian:13all versions · fixed in 3.1.13-2.root.io.13and 1 other package
  • openexrRoot:Debian:12all versions · fixed in 3.1.5-5.root.io.21and 1 other package

17 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-34545 Red Hat Product Security3 known affected

    OpenEXR: OpenEXR: Remote code execution via crafted EXR files

    OpenEXR-devel as a component of Red Hat Enterprise Linux 6 · OpenEXR-libs as a component of Red Hat Enterprise Linux 6 · OpenEXR.src as a component of Red Hat Enterprise Linux 6

Full record on NVD

Fix

  1. Update Openexr to 3.4.7
  2. Workaround from the vendor Red Hat Product Security CVE-2026-34545 · 3 productsRestrict the processing of untrusted OpenEXR image files. Systems should be configured to only decode .exr files from known and trusted sources to prevent exploitation of the heap write overflow vulnerability. This operational control limits exposure to malicious input.
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-34545 · 3 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-04-03
  • CNACVSS 4.08.4known since 2026-10-27
  • CNACVSS 3.18.8known since 2026-10-27
  • NVDCVSS 3.17.3read 2026-10-27
  • CNAweakness (CWE)CWE-122, CWE-1284, CWE-190known since 2026-10-27
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS 4.0 vector
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:X/V:X/RE:X/U:X
Published
2026-04-01
Last Modified
2026-10-26
NVD status
Modified

Frequently asked questions

What is CVE-2026-34545?

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.

Is CVE-2026-34545 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34545, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34545?

CVE-2026-34545 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

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