CVE catalog
CVE-2026-34380
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
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | openexr | sid | 3.4.16+ds-1 | fixed |
| Debian | openexr | forky | 3.4.16+ds-1 | fixed |
| Debian | openexr | trixie | 3.1.13-2 | vulnerable |
| Debian | openexr | bookworm | 3.1.5-5 | vulnerable |
| Cpe | openexr | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | fixed |
| Cpe | libopenexr-3-1-30 | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | fixed |
| Cpe | libopenexr-dev | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | fixed |
| Cpe | libopenexr-doc | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | fixed |
| Cpe | openexr | Not reported | Not reported | vulnerable |
| Cpe | openexr | Not reported | 3.2.7 | fixed |
| Cpe | openexr | Not reported | 3.3.9 | fixed |
| Cpe | openexr | Not reported | 3.4.9 | fixed |
| Cpe | openexr | Not reported | 3.4.9 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | openexr | source | sid | 3.4.14-0.1 | not yet assigned | Not reported | [1133188] |
| Debian | openexr | source | forky | 3.4.14-0.1 | not yet assigned | Not reported | [1133188] |
| Debian | openexr | source | trixie | (unfixed) | not yet assigned | Not reported | [1133188] |
| Debian | openexr | source | bookworm | (unfixed) | not yet assigned | Not reported | [1133188] |
| Cpe | openexr | cpe | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Cpe | libopenexr-3-1-30 | cpe | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Cpe | libopenexr-dev | cpe | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Cpe | libopenexr-doc | cpe | Not reported | 3.1.5-5.1ubuntu0.1~esm1 | Not reported | Not reported | Not reported |
| Cpe | openexr | cpe | Not reported | 3.2.7 | Not reported | Not reported | Not reported |
| Cpe | openexr | cpe | Not reported | 3.3.9 | Not reported | Not reported | Not reported |
| Cpe | openexr | cpe | Not reported | 3.4.9 | Not reported | Not reported | Not reported |
| Cpe | openexr | cpe | Not reported | 3.4.9 | Not reported | NVD-CVE-2026-34380 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libopenexr-3-1-30]Affected
Source package: [openexr]
Details (2)
3.1.5-5· amd64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
3.1.5-5· arm64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- [libopenexr-dev]Affected
Source package: [openexr]
Details (2)
3.1.5-5· amd64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
3.1.5-5· arm64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- [libopenexr-doc]Affected
Source package: [openexr]
Details (2)
3.1.5-5· all · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
3.1.5-5· all · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- [openexr]Affected
Details (2)
3.1.5-5· amd64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
3.1.5-5· arm64 · bookwormAffected
nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
[Debian 13 (Trixie)]
- [libopenexr-3-1-30]Affected
Source package: [openexr]
Details (2)
3.1.13-2· amd64 · trixieAffected
nvd · openexr · debian · 13
3.1.13-2· arm64 · trixieAffected
nvd · openexr · debian · 13
- [libopenexr-dev]Affected
Source package: [openexr]
Details (2)
3.1.13-2· amd64 · trixieAffected
nvd · openexr · debian · 13
3.1.13-2· arm64 · trixieAffected
nvd · openexr · debian · 13
- [libopenexr-doc]Affected
Source package: [openexr]
Details (2)
3.1.13-2· all · trixieAffected
nvd · openexr · debian · 13
3.1.13-2· all · trixieAffected
nvd · openexr · debian · 13
- [openexr]Affected
Details (2)
3.1.13-2· amd64 · trixieAffected
nvd · openexr · debian · 13
3.1.13-2· arm64 · trixieAffected
nvd · openexr · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10505-1.json]
- [https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7]
- [https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9]
- [https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9]
- [https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-34380]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-34380]
- [https://security-tracker.debian.org/tracker/CVE-2026-34380]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34380.json]
- [https://ubuntu.com/security/notices/USN-8259-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]