Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AcademySoftwareFoundation | openexr | >= 3.3.0, < 3.3.7, >= 3.4.0, < 3.4.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openexr | 3.4.5-1.1 | openSUSE-SU-2026:10272-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openexr +7 | 3.4.5-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | openexr | >= 3.3.0, < 3.3.7 | 3.3.7 | GHSA-q6vj-wxvf-5m8c |
| PyPI | openexr | >= 3.4.0, < 3.4.5 | 3.4.5 | GHSA-q6vj-wxvf-5m8c |
| PyPI | openexr | >= 3.3.0, < 3.3.7 · >= 3.4.0, < 3.4.5 | 3.3.7, 3.4.5 | PYSEC-2026-2849 |
Advisories 1
- openSUSE-SU-2026:10272-1 libIex-3_4-33-3.4.5-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026