OpenEXR Makes Use of Uninitialized Memory
Priority MEDIUM 44CWE-457Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
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 3.3.5 and 3.4.0 through 3.4.2, while fuzzing `openexr_exrcheck_fuzzer`, Valgrind reports a conditional branch depending on uninitialized data inside `generic_unpack`. This indicates a use of uninitialized memory. The issue can result in undefined behavior and/or a potential crash/denial of service. Versions 3.3.6 and 3.4.3 fix the issue.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00409 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial openexr (AcademySoftwareFoundation): 3.3.6, 3.4.3OpenEXR (PyPI): 3.3.6, 3.4.3Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AcademySoftwareFoundation | openexr | 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.3 | 3.3.6, 3.4.3 | Patch available | CNA |
| — | OpenEXR (PyPI) | 3.3.0 to before 3.3.6 | 3.3.6 | Patch available | GHSA-3h9h-qfvw-98hq |
| — | OpenEXR (PyPI) | 3.4.0 to before 3.4.3 | 3.4.3 | Patch available | GHSA-3h9h-qfvw-98hq |
- openexr VendorAcademySoftwareFoundation Affected 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.3 Fixed in 3.3.6, 3.4.3 Patch available CNA
- OpenEXR (PyPI) Vendor— Affected 3.3.0 to before 3.3.6 Fixed in 3.3.6 Patch available GHSA-3h9h-qfvw-98hq
- OpenEXR (PyPI) Vendor— Affected 3.4.0 to before 3.4.3 Fixed in 3.4.3 Patch available GHSA-3h9h-qfvw-98hq
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* | 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.3 | Vulnerable | Academy Software Foundation |
- cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* Versions 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.3 Vulnerable ·Academy Software Foundation
Remediation
- Fix · CNA openexr (AcademySoftwareFoundation) Fixed in 3.3.6, 3.4.3
- Fix · GHSA-3h9h-qfvw-98hq OpenEXR (PyPI) Fixed in 3.3.6 Advisory →
- Fix · GHSA-3h9h-qfvw-98hq OpenEXR (PyPI) Fixed in 3.4.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2025-64181
- 2026-10-03 Alias added: GHSA-3h9h-qfvw-98hq
References
Exploit 1
Other 6
- https://github.com/user-attachments/files/23024726/archive0.zip
- https://github.com/user-attachments/files/23024736/archive1.zip
- https://github.com/user-attachments/files/23024740/archive2.zip
- https://github.com/user-attachments/files/23024744/archive3.zip
- https://github.com/user-attachments/files/23024746/archive4.zip
- https://github.com/AcademySoftwareFoundation/openexr
More AcademySoftwareFoundation vulnerabilities
- TI-2026-30739 OpenColorIO vulnerable to stack buffer overflow via unbounded `sscanf %s` in Spi3D (.spi3d) LUT parser CVSS 4.0HIGH 8.4
- TI-2026-38605 OpenEXR: Unhandled assert abort in HTJ2K decoder via crafted QCD marker (DoS) CVSS 4.0HIGH 7.1
- TI-2026-48281 OpenEXR: Heap out-of-bounds write in exrmultiview with subsampled channel union CVSS 3.1HIGH 7.1
- TI-2026-48279 OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collision CVSS 3.1HIGH 7.1
- TI-2026-42768 OpenEXR: Heap OOB read in SampleCountChannel row when using nonzero dataWindow CVSS 3.1HIGH 7.1
- TI-2026-42338 OpenEXR: Out-of-bounds read in DeepImageChannel::row() for non-zero dataWindow origin CVSS 3.1HIGH 7.1
Sources
- CVE-2025-64181 · CVE Program
- CVE-2025-64181 · NVD
- FIRST EPSS
- GHSA-3h9h-qfvw-98hq · GitHub Advisory Database · CC BY 4.0
- CVE-2025-64181 · Red Hat security data · CC BY 4.0
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