CVE-2026-40250 OpenEXR has integer overflow in DWA decoder outBufferEnd pointer arithmetic (missed variant of CVE-2026-34589)
An integer overflow in the DWA decoder allows attackers to cause memory corruption or crashes via malicious EXR files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-40250?
CVE-2026-40250 is a high-severity vulnerability in Openexr Openexr, published on 21 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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`.
Weakness: CWE-190
Which versions are affected by CVE-2026-40250?
It affects 1 product.
Products include Openexr Openexr.
How do I fix CVE-2026-40250?
Upgrade to a fixed version.
Is CVE-2026-40250 being exploited?
There is no known exploitation of CVE-2026-40250 in the wild and no public exploit code.
Other vulnerabilities in Openexr Openexr
- CVE-2023-5841 OpenEXR Heap Overflow in Scanline Deep Data Parsing
- CVE-2026-41142 OpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write via OpenEXRUtil public API
- CVE-2026-42216 OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion
- CVE-2017-9111 OpenEXR invalid write
- CVE-2017-9113 Memory corruption in n/a
Sources
Also known as BELL-CVE-2026-40250, DEBIAN-CVE-2026-40250, GHSA-m5qw-23x2-6phj, JLSEC-2026-808, ROOT-OS-DEBIAN-11-CVE-2026-40250, ROOT-OS-DEBIAN-12-CVE-2026-40250 and 2 more.