CVE-2026-26981
Medium · 6.5CVSS
6.5
EPSS
0.6%
Published
Feb 24, 2026
CISA due date
—
The record
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Chainguard | openexr | 0 | 3.4.5-r0 |
| Chainguard | openexr-dev | 0 | 3.4.5-r0 |
| Chainguard | openexr-doc | 0 | 3.4.5-r0 |
| Chainguard | openexr-libiex | 0 | 3.4.5-r0 |
| Chainguard | openexr-libilmthread | 0 | 3.4.5-r0 |
| Chainguard | openexr-libopenexr | 0 | 3.4.5-r0 |
| Chainguard | openexr-libopenexrcore | 0 | 3.4.5-r0 |
| Chainguard | openexr-libopenexrutil | 0 | 3.4.5-r0 |
| Wolfi | openexr | 0 | 3.4.5-r0 |
| Wolfi | openexr-dev | 0 | 3.4.5-r0 |
| Wolfi | openexr-doc | 0 | 3.4.5-r0 |
| Wolfi | openexr-libiex | 0 | 3.4.5-r0 |
| Wolfi | openexr-libilmthread | 0 | 3.4.5-r0 |
| Wolfi | openexr-libopenexr | 0 | 3.4.5-r0 |
| Wolfi | openexr-libopenexrcore | 0 | 3.4.5-r0 |
| Wolfi | openexr-libopenexrutil | 0 | 3.4.5-r0 |
| openSUSE:Tumbleweed | openexr | 0 | 3.4.5-1.1 |
Related vulnerabilities
- CVE-2026-34544 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
- CVE-2026-34545 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
- CVE-2026-34543 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
- CVE-2026-44663 OpenEXR is the reference implementation and specification for the EXR image format… Also affects openexr
- CVE-2026-45696 OpenEXR is the reference implementation and specification for the EXR image format… Also affects openexr
- CVE-2026-42217 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
- CVE-2026-42216 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr
- CVE-2026-41142 OpenEXR provides the specification and reference implementation of the EXR file format… Also affects openexr