CVE-2026-34380
Last modified
CVE-2026-34380 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. The expression (uint64_t)(w * 3) computes w * 3 as a signed 32-bit integer before casting to uint64_t. When w is large, this multiplication constitutes undefined behavior under the C standard. On tested builds (clang/gcc without sanitizers), two's-complement wraparound commonly occurs, and for specific values of w the wrapped result is a small positive integer, which may allow the subsequent bounds check to pass incorrectly. If the check is bypassed, the decoding loop proceeds to write pixel data through dout, potentially extending far beyond the allocated output buffer. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openexr | Openexr | >= 3.2.0, < 3.2.7 |
| Openexr | Openexr | >= 3.3.0, < 3.3.9 |
| Openexr | Openexr | >= 3.4.0, < 3.4.9 |
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7Product, Release Notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9Product, Release Notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9Product, Release Notes
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-34380?
How severe is CVE-2026-34380?
How do I fix CVE-2026-34380?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-34375WWBN AVideo is an open source video platform. In versions up…8.2
- CVE-2026-34376PdfDing is a selfhosted PDF manager, viewer and editor offer…7.5
- CVE-2026-34377ZEBRA is a Zcash node written entirely in Rust. Prior to zeb…8.1
- CVE-2026-34378OpenEXR provides the specification and reference implementat…6.5
- CVE-2026-34379OpenEXR provides the specification and reference implementat…7.1
- CVE-2026-3438A reflected cross-site scripting vulnerability exists in Son…5.1
- CVE-2026-34381Admidio is an open-source user management solution. From ver…7.5
- CVE-2026-34382Admidio is an open-source user management solution. From ver…4.6
- CVE-2026-34383Admidio is an open-source user management solution. Prior to…3.5
- CVE-2026-34384Admidio is an open-source user management solution. Prior to…7.3
- CVE-2026-34385Fleet is open source device management software. Prior to 4.…8.1
- CVE-2026-34386Fleet is open source device management software. Prior to 4.…8.8
Are you affected by CVE-2026-34380?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST