CVE-2026-34379
- Source
- https://cve.org/CVERecord?id=CVE-2026-34379
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34379.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-34379
- Aliases
-
- GHSA-w88v-vqhq-5p24
- Downstream
- Related
- Published
- 2026-04-06T15:21:06.556Z
- Modified
- 2026-07-08T07:01:41.742713678Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H CVSS Calculator
- Summary
- OpenEXR has a misaligned write in LossyDctDecoder_execute leading to undefined behavior (DWA/DWAB decompression)
- Details
-
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 LossyDctDecoderexecute() in src/lib/OpenEXRCore/internaldwadecoder.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 uint8t * 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34379.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-704", "CWE-787", "CWE-843" ] }- References
-
- 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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34379.json
- https://access.redhat.com/security/cve/CVE-2026-34379
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-w88v-vqhq-5p24
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34379.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-34379
- https://bugzilla.redhat.com/show_bug.cgi?id=2455402
Affected packages
Git / github.com/academysoftwarefoundation/openexr
Affected ranges
- Type
- GIT
- Repo
- https://github.com/academysoftwarefoundation/openexr
- Events
- Database specific
{ "source": [ "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "3.2.0" }, { "fixed": "3.2.7" }, { "introduced": "3.3.0" }, { "fixed": "3.3.9" }, { "introduced": "3.4.0" }, { "fixed": "3.4.9" } ] }