Is CVE-2026-34378 actively exploited?

No active exploitation of CVE-2026-34378 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34378 be exploited remotely?

Yes. CVE-2026-34378 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34378?

CVE-2026-34378 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-34378

CWE-190Published: April 6, 2026· Updated: Apr 7, 2026

6.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.9th

Official Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.

NVD Source

Technical Analysis

CVE-2026-34378 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.