PT-2026-30657 · Openexr · Openexr

Pwn2Woot · Published 2026-04-06 · Updated 2026-04-08 · CVE-2026-34378

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions OpenEXR versions 3.4.0 through 3.4.8

Description A missing bounds check on the dataWindow attribute in EXR file headers can lead to a signed integer overflow in the generic unpack() function. Setting dataWindow.min.x to a large negative value causes OpenEXRCore to calculate an excessively large image width. This width is then used in a signed integer multiplication, resulting in an overflow and process termination via SIGILL and UBSan.

Recommendations Update to version 3.4.9 or later.

Exploit

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-34378

OPENSUSE-SU-2026:10505-1

Affected Products

Openexr

References · 22

• 🔥 https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g · Exploit
• https://osv.dev/vulnerability/openSUSE-SU-2026:10505-1 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-34378 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-34378 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-34378 · Security Note
• https://ubuntu.com/security/CVE-2026-34378 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-34378 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34378 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-34378 · Vendor Advisory
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9 · Note
• https://github.com/AcademySoftwareFoundation/openexr/commit/088859fb6199e56824c4c9ed60afc825261bfea9 · Note
• https://github.com/AcademySoftwareFoundation/openexr/pull/2321 · Note
• https://github.com/AcademySoftwareFoundation/openexr/commit/7a1c64ca74d12bf5f64a912d4e12a651689f8652 · Note
• https://suse.com/security/cve/CVE-2026-34380 · Note
• https://suse.com/security/cve/CVE-2026-34589 · Note