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Fencer Vulns
high 8.8

CVE-2026-34589 json

OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write

published 2026-04-06 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-19348 , GHSA-p8xc-w3q4-h64x , JLSEC-2026-149 , PYSEC-2026-2848

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
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 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Patch / fix

  • pypi openexr 3.2.7, 3.3.9, 3.4.9
  • julia OpenEXR_jll 3.4.9+0
  • openexr openexr 3.2.7, 3.3.9, 3.4.9
  • openexr Debian 14 3.4.14-0.1

debian advisories DEBIAN-CVE-2026-34589

  • openexr openSUSE Leap 16.0 3.2.2-160000.6.1
  • openexr openSUSE Tumbleweed 3.4.9-1.1

opensuse advisories openSUSE-SU-2026:20605-1openSUSE-SU-2026:10505-1

  • 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-2026-34589

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-2026-34589 updated cvss 8.8

OpenEXR: OpenEXR: Memory corruption leading to arbitrary code execution or denial of service

  • Red Hat Enterprise Linux 6 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 7 OpenEXR, OpenEXR-libs
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 OpenEXR, OpenEXR-libs Red Hat Enterprise Linux 9 OpenEXR Red Hat Enterprise Linux 10 OpenEXR
    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
none
Automatable
no
Technical impact
total
Assessed
7 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x 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
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
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 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi openexr
>=3.2.0, <3.2.7
>=3.3.0, <3.3.9
>=3.4.0, <3.4.9
3.2.7
3.3.9
3.4.9
julia OpenEXR_jll
>=3.1.4+0, <3.4.9+0
3.4.9+0

Affected products

  • AcademySoftwareFoundation openexr
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

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.