CVE catalog
CVE-2026-34379
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 misalig
- Severity
- High · CVSS 7.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.28% · 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 misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constitutes undefined behavior under the C standard and crashes immediately on architectures that enforce alignment (ARM, RISC-V, etc.). On x86 it is silently tolerated at runtime but remains exploitable via compiler optimizations that assume aligned access. 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 | 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 |
| Opensuse | openexr | leap 16.0 | 3.2.2-160000.6.1 | 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 | 3.2.7 | 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 |
| Opensuse | openexr | rpm | leap 16.0 | 3.2.2-160000.6.1 | Not reported | OPENSUSE-SU-2026:20605-1 | Not reported |
| Cpe | openexr | cpe | Not reported | 3.4.9 | Not reported | NVD-CVE-2026-34379 | 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://access.redhat.com/security/cve/CVE-2026-34379]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2455402]
- [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-w88v-vqhq-5p24]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-34379]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-34379]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20605-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-34379]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34379.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]