CVE-2026-26981: medium-severity vulnerability in AcademySoftwareFoundation openexr
OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
Published
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected products
AcademySoftwareFoundation · openexrRelated CVEs — AcademySoftwareFoundation openexr
In the same product, most dangerous first.
CVE-2026-34545HIGHOpenEXR: integer overflow lead to OOB in HTJ2K decoderEPSS 0.7%CVE-2026-41142HIGHOpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write via OpenEXRUtil public APIEPSS 0.7%CVE-2026-42216HIGHOpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansionEPSS 0.7%CVE-2026-42217MEDIUMOpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.cpp`)EPSS 0.7%CVE-2026-34588HIGHOpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/WriteEPSS 0.6%CVE-2026-34543HIGHOpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl)EPSS 0.5%
References
https://github.com/AcademySoftwareFoundation/openexr/commit/6bb2ddf1068573d073edf81270a015b38cc05cefhttps://github.com/AcademySoftwareFoundation/openexr/commit/d2be382758adc3e9ab83a3de35138ec28d93ebd8https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q6vj-wxvf-5m8c