Integer Overflow or Wraparound Affecting openexr-debuginfo package, versions <0:3.1.5-1.amzn2023.0.9


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-AMZN2023-OPENEXRDEBUGINFO-16350893
  • published3 May 2026
  • disclosed6 Apr 2026

Introduced: 6 Apr 2026

CVE-2026-34380  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 openexr-debuginfo to version 0:3.1.5-1.amzn2023.0.9 or higher.
This issue was patched in ALAS2023-2026-1612.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openexr-debuginfo package and not the openexr-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1