CVE-2026-34588
OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write
02 Description
OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.48% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 41.2% of scored records. A rank, not a probability.
- NVD base score
- 8.6 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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 analysis status
- Modified. NVD last modified this record on 2026-10-26.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-04-06 15:31Z6 MO AGO
- Last updated
- 2026-09-09 12:05Z1 MO AGO
- Reserved
- 2026-03-30
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.6)
- CNA CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- Data version
- 5.2
- Document digest
- f009f2ad12e1ac207de0f7a7963d0301f669a585b725440151457a79d9b5e4fd
05 Affected products
06 References
- github.comhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hf
- github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7
- github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9
- github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-34588
- bugzilla.redhat.comRHBZ#2455408https://bugzilla.redhat.com/show_bug.cgi?id=2455408
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:17656
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:15888
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19146
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19587
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:17659
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:17658
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:17660
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:15887
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:19359
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30078
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30089
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30088
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30087
07 Fixed in
AlmaLinux 9
- openexr Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
- openexr-devel Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
- openexr-libs Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- openexr Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
- openexr-devel Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
- openexr-libs Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- openexr Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
- openexr-devel Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
- openexr-libs Fixed
A version is affected if any line below covers it.
- Affected before 3.1.1-3.el9_7.2
- Affected before 3.1.1-3.el9_8.2
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- openexr Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
- openexr-devel Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
- openexr-libs Fixed
A version is affected if any line below covers it.
- Affected before 3.1.10-8.el10_1.2
- Affected before 3.1.10-8.el10_2.2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- openexr No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- openexr No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- openexr Fixed in 3.4.14-0.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- openexr No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- openexr No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- openexr Fixed in 3.1.5-5.1ubuntu0.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 26.04 LTS
- openexr Fixed in 3.1.13-2ubuntu0.26.04.1~esm1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.