🛡️ CVE-2026-34380 on Ubuntu — openexr

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. The expression (uint64_t)(w * 3) computes w * 3 as a signed 32-bit integer before casting to uint64_t. When w is large, this multiplication constitutes undefined behavior under the C standard. On tested builds (clang/gcc without sanitizers), two's-complement wraparound commonly occurs, and for specific values of w the wrapped result is a small positive integer, which may allow the subsequent bounds check to pass incorrectly. If the check is bypassed, the decoding loop proceeds to write pixel data through dout, potentially extending far beyond the allocated output buffer. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Distribution advisory

This page covers CVE-2026-34380 as tracked by Ubuntu, for the package openexr. The fix is available in version 3.1.13-2ubuntu0.26.04.1~esm1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability high.

Affected software and timeline

Affected software: openexr (fixed in 3.1.13-2ubuntu0.26.04.1~esm1). Published on 6 April 2026 and last revised on 8 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
ubuntu.com (Advisory)

CVE-2026-34380 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-04-06
Updated 2026-08-12
Modified 2026-05-08
Fix URL N/A

Affected Packages

Software From version Fixed in
openexr — 3.1.13-2ubuntu0.26.04.1~esm1

References

Similar Threats

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