CVE catalog

CVE-2026-55371

Severity: Medium · CVSS 6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Jul 8, 2026, 12:00:00 AM UTC
Updated: Aug 25, 2026, 1:16:36 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.17% · Oct 25, 2026

OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_bytes(). The public setter validates the top-level exr_attr_bytes_t value pointer but does not verify that the nested type_hint pointer is non-NULL when hint_length is greater than zero. When a caller supplies a positive hint_length together with a NULL type_hint, exr_attr_bytes_create() allocates a destination type-hint buffer and then copies from the NULL source pointer, causing a deterministic crash. The flaw is reachable through the public OpenEXRCore C API and results in a denial of service. The issue is fixed in version 3.4.13.

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

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	Not reported
Debian	openexr	source	forky	`3.4.14-0.1`	not yet assigned	Not reported	Not reported
Debian	openexr	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	openexr	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libopenexr-3-1-30]Affected
Source package: [openexr]
Details (2)
- 3.1.5-5 · amd64 · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- 3.1.5-5 · arm64 · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
[libopenexr-dev]Affected
Source package: [openexr]
Details (2)
- 3.1.5-5 · amd64 · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- 3.1.5-5 · arm64 · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
[libopenexr-doc]Affected
Source package: [openexr]
Details (2)
- 3.1.5-5 · all · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- 3.1.5-5 · all · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
[openexr]Affected
Details (2)
- 3.1.5-5 · amd64 · bookworm
  Affected
  nvd · openexr · debian · bookworm; nvd · openexr · debian · 12
- 3.1.5-5 · arm64 · bookworm
  Affected
  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 · trixie
  Affected
  nvd · openexr · debian · 13
- 3.1.13-2 · arm64 · trixie
  Affected
  nvd · openexr · debian · 13
[libopenexr-dev]Affected
Source package: [openexr]
Details (2)
- 3.1.13-2 · amd64 · trixie
  Affected
  nvd · openexr · debian · 13
- 3.1.13-2 · arm64 · trixie
  Affected
  nvd · openexr · debian · 13
[libopenexr-doc]Affected
Source package: [openexr]
Details (2)
- 3.1.13-2 · all · trixie
  Affected
  nvd · openexr · debian · 13
- 3.1.13-2 · all · trixie
  Affected
  nvd · openexr · debian · 13
[openexr]Affected
Details (2)
- 3.1.13-2 · amd64 · trixie
  Affected
  nvd · openexr · debian · 13
- 3.1.13-2 · arm64 · trixie
  Affected
  nvd · openexr · debian · 13

Observed: Oct 23, 2026, 9:44:26 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]