# CVE-2026-40244: OpenEXR has integer overflow in DWA setupChannelData planarUncRle pointer arithmetic (missed variant of CVE-2026-34589)

> An integer overflow in OpenEXR's DWA compressor allows attackers to cause memory corruption or crashes via crafted EXR files.

- **Severity:** High 8.4 (`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`)
- **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:** Yes
- **Published:** 21 Apr 2026
- **Updated:** 15 Jul 2026
- **Also known as:** BELL-CVE-2026-40244, DEBIAN-CVE-2026-40244, GHSA-j526-66f6-fxhx, JLSEC-2026-807, ROOT-OS-DEBIAN-11-CVE-2026-40244, ROOT-OS-DEBIAN-12-CVE-2026-40244, ROOT-OS-DEBIAN-13-CVE-2026-40244, UBUNTU-CVE-2026-40244

## What is CVE-2026-40244?

CVE-2026-40244 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:1722` performs `curc->width * curc->height` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other locations by the recent CVE-2026-34589 batch, 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:1722`.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-40244?

It affects 1 product.


Products: Openexr Openexr.

## How do I fix CVE-2026-40244?

Upgrade to a fixed version.

## Is CVE-2026-40244 being exploited?

There is no known exploitation of CVE-2026-40244 in the wild and no public exploit code.

## Other vulnerabilities in Openexr Openexr

- [CVE-2023-5841](https://insights.sbomify.com/CVE-2023-5841/): OpenEXR Heap Overflow in Scanline Deep Data Parsing (critical 9.1)
- [CVE-2026-41142](https://insights.sbomify.com/CVE-2026-41142/): OpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write via OpenEXRUtil public API (high 8.8)
- [CVE-2026-42216](https://insights.sbomify.com/CVE-2026-42216/): OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion (high 8.8)
- [CVE-2017-9111](https://insights.sbomify.com/CVE-2017-9111/): OpenEXR invalid write (high 8.8)
- [CVE-2017-9113](https://insights.sbomify.com/CVE-2017-9113/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40244 and fix it if it is affected.

What it is: CVE-2026-40244 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.
Exploitation: There is no known exploitation of CVE-2026-40244 in the wild and no public exploit code.

Affected product: Openexr Openexr. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-40244/ (Markdown: https://insights.sbomify.com/CVE-2026-40244/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40244
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40244
- OSV: https://osv.dev/vulnerability/CVE-2026-40244

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40244/
Summaries are generated and may contain mistakes; the official description above is the record.