CVE-2026-34380 (GCVE-0-2026-34380)

Vulnerability from cvelistv5 – Published: 2026-04-06 15:22 – Updated: 2026-04-07 14:15
VLAI?
Title
OpenEXR has a signed integer overflow (undefined behavior) in undo_pxr24_impl may allow bounds-check bypass in PXR24 decompression
Summary
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.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-787 - Out-of-bounds Write
Assigner
References
Impacted products
Vendor Product Version
AcademySoftwareFoundation openexr Affected: >= 3.2.0, < 3.2.7
Affected: >= 3.3.0, < 3.3.9
Affected: >= 3.4.0, < 3.4.9
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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