CVE-2026-34544CWE-190CWE-787

OpenEXR: integer overflow to OOB write in uncompress_b44_impl()

High · published April 1, 2026

CVSS v4.0
8.4
EPSS
0%
Percentile
14.7
In the wild
Unconfirmed
What it is

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.

The record
Technical detail
CVSS v4.0
8.4 · HIGH
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00244 · 14.7th percentile
Weaknesses
CWE-190 · Integer Overflow or Wraparound; CWE-787 · Out-of-bounds Write
Published
2026-04-01T20:55Z
EPSS history
Timeline
  • 01 APR 20:55Z
    OpenEXR: integer overflow to OOB write in uncompress_b44_impl()
    cvelistv5