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Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40250OpenEXR has integer overflow in DWA decoder outBufferEnd pointer arithmetic (missed variant of CVE-2026-34589)

High 8.4

In plain English

A high-severity integer overflow in openexr from AcademySoftwareFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.4High
Exploit odds (30 days)0.4%top 60.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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`.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.22openexr3.3.11-r0ALPINE-CVE-2026-40250
Alpine:v3.23openexr3.4.13-r0ALPINE-CVE-2026-40250
Alpine:v3.24openexr3.4.10-r0ALPINE-CVE-2026-40250
Debian:12openexrno fix listedDEBIAN-CVE-2026-40250
Debian:13openexrno fix listedDEBIAN-CVE-2026-40250
Debian:14openexr3.4.14-0.1DEBIAN-CVE-2026-40250
Ubuntu:26.10openexrno fix listedUBUNTU-CVE-2026-40250

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation openexr >= 3.2.0, < 3.2.8>= 3.3.0, < 3.3.10>= 3.4.0, < 3.4.10

Weakness: CWE-190 · 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

References