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Fencer Vulns
high 7.3

CVE-2026-34544 json

OpenEXR: integer overflow to OOB write in uncompress_b44_impl()

published 2026-04-01 7 mo ago modified 2026-10-26 14 d ago also EUVD-2026-18060 , GHSA-h762-rhv3-h25v , JLSEC-2026-146 , PYSEC-2026-2847

cvss
7.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.

Patch / fix

  • pypi openexr 3.4.8
  • julia OpenEXR_jll 3.4.8+0
  • openexr openexr 3.4.8
  • openexr Debian 14 3.4.14-0.1

debian advisories DEBIAN-CVE-2026-34544

  • openexr RHEL 10.2 3.1.10-8.el10_2.5
  • openexr-libs RHEL 10.2 3.1.10-8.el10_2.5

red hat advisories RHSA-2026:84796

  • openexr openSUSE Tumbleweed 3.4.9-1.1

opensuse advisories openSUSE-SU-2026:10505-1

  • openexr AlmaLinux 10 3.1.10-8.el10_2.5
  • openexr-libs AlmaLinux 10 3.1.10-8.el10_2.5

almalinux advisories ALSA-2026:84796

  • openexr Rocky Linux 9 3.1.1-3.el9_8.5
  • openexr Rocky Linux 10 3.1.10-8.el10_2.5

rocky linux advisories RLSA-2026:86983RLSA-2026:84796

  • openexr Alpine 3.22 3.3.11-r0
  • openexr Alpine 3.23 3.4.13-r0
  • openexr Alpine 3.24 3.4.10-r0

alpine advisories ALPINE-CVE-2026-34544

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-34544 updated cvss 6.6

OpenEXR: OpenEXR: Memory corruption and Denial of Service via crafted EXR file processing

  • Red Hat Enterprise Linux 6 OpenEXR, OpenEXR-libs
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 9) openexr 3.1.1-3.el9_8.5, openexr-libs 3.1.1-3.el9_8.5
    fixed: vendor fix RHSA-2026:86983
  • Red Hat Enterprise Linux AppStream (v. 10) openexr 3.1.10-8.el10_2.5, openexr-libs 3.1.10-8.el10_2.5
    fixed: vendor fix RHSA-2026:84796
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) openexr-devel 3.1.1-3.el9_8.5, openexr-debuginfo 3.1.1-3.el9_8.5, openexr-debugsource 3.1.1-3.el9_8.5, openexr-libs-debuginfo 3.1.1-3.el9_8.5
    fixed: vendor fix RHSA-2026:86983
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) openexr-devel 3.1.10-8.el10_2.5, openexr-debuginfo 3.1.10-8.el10_2.5, openexr-debugsource 3.1.10-8.el10_2.5, openexr-libs-debuginfo 3.1.10-8.el10_2.5
    fixed: vendor fix RHSA-2026:84796
  • Red Hat Enterprise Linux 7 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 8 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
total
Assessed
7 mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-h762-rhv3-h25v referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.4 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.4 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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
NVD 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi openexr
>=3.4.0, <3.4.8
>=3.3.0, <=3.3.8
>=3.2.0, <=3.2.6
>=3.2.0, <3.4.8
3.4.8
julia OpenEXR_jll
>=3.1.4+0, <3.4.8+0
3.4.8+0

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.