DEBIAN-CVE-2026-34379
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-34379
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34379.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-34379
- Upstream
- Published
- 2026-04-06T16:16:35Z
- Modified
- 2026-09-14T17:03:08Z
- 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
- [none]
- 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 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.
- References
Affected packages
Debian:12 / openexr
Package
- Name
- openexr
- Purl
- pkg:deb/debian/openexr?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / openexr
Package
- Name
- openexr
- Purl
- pkg:deb/debian/openexr?arch=source&distro=trixie
Debian:14 / openexr
Package
- Name
- openexr
- Purl
- pkg:deb/debian/openexr?arch=source&distro=forky