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Fencer Vulns
medium 6.1

CVE-2026-55059 json

OpenEXR: OpenEXRUtil SampleCountChannel row setter heap has an out-of-bounds write vulnerability

published 2026-08-25 2 mo ago modified 2026-10-12 27 d ago also EUVD-2026-65183

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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 a heap out-of-bounds write in Imf_4_0::SampleCountChannel::set(int r, unsigned int newNumSamples[]). The row-based sample-count setter computes the target Y coordinate with dataWindow.min.x instead of dataWindow.min.y. For a valid deep image data window where min.x != min.y, a valid row index can be translated into an invalid Y coordinate, causing writes before the allocated _numSamples buffer. The vulnerability is reachable through the public OpenEXRUtil DeepImage API and can lead to heap corruption and process crashes. This issue has been fixed in versions 3.2.10, 3.3.12 and 3.4.13.

Patch / fix

  • openexr openexr 3.2.10, 3.3.12, 3.4.13
  • openexr Debian 14 3.4.14-0.1

debian advisories DEBIAN-CVE-2026-55059

  • openexr SLE Module for Desktop Applications 15 SP7 2.2.1-150000.3.52.1
  • openexr SLES for SAP applications 16.0, SLES 16.0 3.2.2-160000.9.1

suse advisories SUSE-SU-2026:3169-1SUSE-SU-2026:22653-1

  • openexr openSUSE Leap 16.0 3.2.2-160000.9.1
  • openexr openSUSE Tumbleweed 3.4.13-1.1

opensuse advisories openSUSE-SU-2026:21336-1openSUSE-SU-2026:11218-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55059 updated cvss 5.5

OpenEXR: OpenEXR: Heap out-of-bounds write leads to denial of service

  • Red Hat Enterprise Linux 8 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 9 openexr, openexr-libs Red Hat Enterprise Linux 10 openexr
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 7 OpenEXR, OpenEXR-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-54cp-3rq6-7mq8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Affected products

  • AcademySoftwareFoundation openexr

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.