CVE-2026-34588

High

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

SeverityHigh

CVSS7.8

Exploit probability—

ProductOpenexr

PublishedApr 6, 2026

First seenApr 6, 2026

Weakness typeCWE-125Out-of-bounds read CWE-190Integer overflow CWE-787Out-of-bounds write

How to fix

Update

openexr openexr3.2.7, 3.3.9, 3.4.9 or later
openexr3.2.7, 3.3.9, 3.4.9 or later

Vendor advisories

Affected products

Product	Affected versions	Fixed in
openexr openexr	3.1.0 ≤ v < 3.2.7, 3.3.0 ≤ v < 3.3.9, 3.4.0 ≤ v < 3.4.9	3.2.7, 3.3.9, 3.4.9
openexrPyPI	3.1.0 ≤ v < 3.2.7, 3.3.0 ≤ v < 3.3.9, 3.4.0 ≤ v < 3.4.9	3.2.7, 3.3.9, 3.4.9

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.