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CVE-2025-64183

Openexr use-after-free

7.5 HIGHPublic exploitEPSS 0.30%
  1. Published10 Nov 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Openexr≥ 3.2.0 < 3.2.5 · ≥ 3.3.0 < 3.3.6 · ≥ 3.4.0 < 3.4.3

Remediation

Fixed in
Openexr≥ 3.2.5

References

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Frequently asked

Is CVE-2025-64183 being actively exploited?

CVE-2025-64183 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.30%.

How severe is CVE-2025-64183?

CVE-2025-64183 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2025-64183?

Affected products include Openexr.

How do I fix CVE-2025-64183?

Upgrade affected software to a fixed version, for example Openexr 3.2.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-64183 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.