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CVE-2026-34544

Openexr buffer overflow

7.3 HIGHPublic exploitEPSS 0.21%
  1. Published1 Apr 2026

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 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

Openexr≥ 3.2.0 < 3.2.7 · ≥ 3.3.0 < 3.3.9 · ≥ 3.4.0 < 3.4.8

Remediation

Fixed in
Openexr≥ 3.2.7

References

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Frequently asked

Is CVE-2026-34544 being actively exploited?

CVE-2026-34544 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.21%.

How severe is CVE-2026-34544?

CVE-2026-34544 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 0.21% probability of exploitation.

Which products are affected by CVE-2026-34544?

Affected products include Openexr.

How do I fix CVE-2026-34544?

Upgrade affected software to a fixed version, for example Openexr 3.2.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34544 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.