Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M
CVE-2026-59186OpenEXR: Heap out-of-bounds write in TiledRgbaInputFile via integer overflow on 32-bit (ILP32) builds
High 7.1
In plain English
A high-severity heap buffer overflow in openexr from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D<Rgba> tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | OpenEXR-devel | 2.2.0-12.el8_10.3 | ALSA-2026:82345 |
| AlmaLinux:8 | OpenEXR-libs | 2.2.0-12.el8_10.3 | ALSA-2026:82345 |
| Alpine:v3.24 | openexr | 3.4.15-r0 | ALPINE-CVE-2026-59186 |
| Debian:12 | openexr | no fix listed | DEBIAN-CVE-2026-59186 |
| Debian:13 | openexr | no fix listed | DEBIAN-CVE-2026-59186 |
| Debian:14 | openexr | 3.4.14-0.1 | DEBIAN-CVE-2026-59186 |
| Rocky Linux:8 | OpenEXR | 0:2.2.0-12.el8_10.3 | RLSA-2026:82345 |
| Ubuntu:26.10 | openexr | no fix listed | UBUNTU-CVE-2026-59186 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AcademySoftwareFoundation | openexr | < 3.2.11>= 3.3.0, < 3.3.13>= 3.4.0, < 3.4.14 |
Weakness: CWE-122, CWE-190, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
References
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-f667-c4wm-c8gq x_refsource_CONFIRM
- https://github.com/AcademySoftwareFoundation/openexr/commit/71907b44ce9a1b05bf3934b8a7821752750731ab x_refsource_MISC
- https://github.com/AcademySoftwareFoundation/openexr/commit/904141d3a1f86327ad1e2b93fc92ce2dd5881d34 x_refsource_MISC
- https://github.com/AcademySoftwareFoundation/openexr/commit/b1a5887372772d79328f4eb42b7f86352a38170b x_refsource_MISC