Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.2.0 through 3.2.4, 3.3.0 through 3.3.5, and 3.4.0 through 3.4.2, there is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp. The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.) Versions 3.2.5, 3.3.6, and 3.4.3 fix the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AcademySoftwareFoundation | openexr | >= 3.2.0, < 3.2.5, >= 3.3.0, < 3.3.6, >= 3.4.0, < 3.4.3 | — |
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 | 3.4.3-1.1 | openSUSE-SU-2025:15741-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | openexr | >= 3.2.0, < 3.2.5 | 3.2.5 | GHSA-57cw-j6vp-2p9m |
| PyPI | openexr | >= 3.3.0, < 3.3.6 | 3.3.6 | GHSA-57cw-j6vp-2p9m |
| PyPI | openexr | >= 3.4.0, < 3.4.3 | 3.4.3 | GHSA-57cw-j6vp-2p9m |
| PyPI | openexr | >= 3.2.0, < 3.2.5 · >= 3.3.0, < 3.3.6 · >= 3.4.0, < 3.4.3 | 3.2.5, 3.3.6, 3.4.3 | PYSEC-2026-2844 |
Advisories 1
- openSUSE-SU-2025:15741-1 libIex-3_4-33-3.4.3-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026