DEBIAN-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 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.
DEBIAN-CVE-2026-34379
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-34379
openexr
Source reference: /affected/0/package/name
- Affected versions
- 3.1.13-1
Source reference:
/affected/0/versions3.1.13-2Source reference:
/affected/0/versions3.1.5-5Source reference:
/affected/0/versions3.1.5-5.1Source reference:
/affected/0/versions3.1.5-5.1+hurd.1Source reference:
/affected/0/versions3.4.14-0.1Source reference:
/affected/0/versions3.4.15+ds-1Source reference:
/affected/0/versions3.4.6+ds-1Source reference:
/affected/0/versions3.4.6+ds-2Source reference:
/affected/0/versions3.4.6+ds-3Source reference:
/affected/0/versions3.4.6+ds-4Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
openexr
Source reference: /affected/1/package/name
- Affected versions
- 3.1.13-2
Source reference:
/affected/1/versions3.4.14-0.1Source reference:
/affected/1/versions3.4.15+ds-1Source reference:
/affected/1/versions3.4.6+ds-1Source reference:
/affected/1/versions3.4.6+ds-2Source reference:
/affected/1/versions3.4.6+ds-3Source reference:
/affected/1/versions3.4.6+ds-4Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
openexr
Source reference: /affected/2/package/name
- Affected versions
- 3.1.13-2
Source reference:
/affected/2/versions3.4.6+ds-1Source reference:
/affected/2/versions3.4.6+ds-2Source reference:
/affected/2/versions3.4.6+ds-3Source reference:
/affected/2/versions3.4.6+ds-4Source reference:
/affected/2/versions - Fixed versions
- 3.4.14-0.1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "openexr",
"purl": "pkg:deb/debian/openexr?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.1.13-1",
"3.1.13-2",
"3.1.5-5",
"3.1.5-5.1",
"3.1.5-5.1+hurd.1",
"3.4.14-0.1",
"3.4.15+ds-1",
"3.4.6+ds-1",
"3.4.6+ds-2",
"3.4.6+ds-3",
"3.4.6+ds-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "openexr",
"purl": "pkg:deb/debian/openexr?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.1.13-2",
"3.4.14-0.1",
"3.4.15+ds-1",
"3.4.6+ds-1",
"3.4.6+ds-2",
"3.4.6+ds-3",
"3.4.6+ds-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.14-0.1"
}
]
}
],
"package": {
"name": "openexr",
"purl": "pkg:deb/debian/openexr?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.1.13-2",
"3.4.6+ds-1",
"3.4.6+ds-2",
"3.4.6+ds-3",
"3.4.6+ds-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56380 · Revision 1
- Added to Heist Feed
- Publisher date