CVE catalog

CVE-2026-55373

Severity: Medium · CVSS 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 8, 2026, 12:00:00 AM UTC
Updated: Aug 25, 2026, 1:16:36 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.16% · Oct 25, 2026

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12, and 3.4.13 contain an infinite-loop vulnerability in SampleCountChannel. The helper roundListSizeUp() rounds a sample-list size up to the next power of two using repeated unsigned left shifts, which terminates for normal values but fails for UINT_MAX: the sequence reaches 0x80000000, and the next left shift wraps the 32-bit value to 0. Because 0 remains less than UINT_MAX, the loop never progresses and never exits. The bug is reachable through public OpenEXRUtil APIs, either by editing the sample-count buffer through SampleCountChannel::Edit (whose destructor calls endEdit()) or by calling SampleCountChannel::set(x, y, UINT_MAX) on a valid pixel. This issue has been fixed in versions 3.2.10, 3.3.12, and 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]