High severity · published Apr 21, 2026
CVE-2026-40250
OpenEXR has integer overflow in DWA decoder outBufferEnd pointer arithmetic (missed variant of CVE-2026-34589)
7.1
CVSS
0.4%
EPSS
No
On KEV
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, `internal_dwa_compressor.h:1040` performs `chan->width * chan->bytes_per_element` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other decoders by CVE-2026-34589/34588/34544, but this line was missed. Versions 3.4.10, 3.3.10, and 3.2.8 contain a fix that addresses `internal_dwa_compressor.h:1040`.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openexr · AcademySoftwareFoundation
>= 3.2.0, < 3.2.8; >= 3.3.0, < 3.3.10; >= 3.4.0, < 3.4.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40250
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40250
Product
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.8
Product
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.10
Product
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.10
Mitigation
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-m5qw-23x2-6phj
More from openexr
9.8
CVE-2026-42217
OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.cpp`)
9.1
CVE-2026-42216
OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion
8.8
CVE-2026-41142
OpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write via OpenEXRUtil public API
7.8
CVE-2026-34588
OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write
7.8
CVE-2026-27622
OpenEXR CompositeDeepScanLine integer-overflow leads to heap OOB write