--- id: CVE-2026-34588 title: OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write summary: >- OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working w… severity: high cvss: 8.6 cvssVector: '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' cvssSource: cna cwe: - CWE-125 - CWE-190 - CWE-787 vendor: AcademySoftwareFoundation product: openexr affected: - 'openexr >= 3.1.0, <= 3.1.13' - 'openexr >= 3.2.0, < 3.2.7' - 'openexr >= 3.3.0, < 3.3.9' - 'openexr >= 3.4.0, < 3.4.9' ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-04-07T03:56:04.356566Z' published: '2026-04-06' updated: '2026-09-09' sourceUpdated: '2026-09-09T12:05:01.982Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-34588' references: - url: >- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hf label: >- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hf - url: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7' label: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7' - url: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9' label: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9' - url: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9' label: 'https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9' - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json - url: 'https://access.redhat.com/security/cve/CVE-2026-34588' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2455408' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-34588' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34588' - url: 'https://access.redhat.com/errata/RHSA-2026:17656' - url: 'https://access.redhat.com/errata/RHSA-2026:15888' - url: 'https://access.redhat.com/errata/RHSA-2026:19146' - url: 'https://access.redhat.com/errata/RHSA-2026:19587' - url: 'https://access.redhat.com/errata/RHSA-2026:17659' - url: 'https://access.redhat.com/errata/RHSA-2026:17658' - url: 'https://access.redhat.com/errata/RHSA-2026:17660' - url: 'https://access.redhat.com/errata/RHSA-2026:15887' - url: 'https://access.redhat.com/errata/RHSA-2026:19359' - url: 'https://access.redhat.com/errata/RHSA-2026:30078' - url: 'https://access.redhat.com/errata/RHSA-2026:30089' - url: 'https://access.redhat.com/errata/RHSA-2026:30088' - url: 'https://access.redhat.com/errata/RHSA-2026:30087' - url: 'https://github.com/AcademySoftwareFoundation/openexr' tags: - cve.org - csaf - vex - red-hat - osv - pip epss: 0.00567 epssPercentile: 0.44684 aliases: - GHSA-588r-cr5c-w6hf - PYSEC-2026-2845 ecosystem: pip patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_e4s_v_9_0 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_eus_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - codeready_linux_builder_eus_v_9_4 - codeready_linux_builder_eus_v_9_6 - enterprise_linux_codeready_linux_builder_v_9 - ai_inference_server 3.3 scores: cna: 8.6 vendor: 8.8 ingestedAt: '2026-07-13T18:57:53.072Z' --- ## Overview OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9. ## Affected - `openexr >= 3.1.0, <= 3.1.13` - `openexr >= 3.2.0, < 3.2.7` - `openexr >= 3.3.0, < 3.3.9` - `openexr >= 3.4.0, < 3.4.9` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Package advisory (CVE-2026-34588) Affected packages: - `openexr >= 3.1.0, < 3.2.7` - `openexr >= 3.3.0, < 3.3.9` - `openexr >= 3.4.0, < 3.4.9` Patched in: - `openexr 3.2.7` - `openexr 3.3.9` - `openexr 3.4.9` Source: https://osv.dev/vulnerability/GHSA-588r-cr5c-w6hf ## Vendor advisories - **RHSA-2026:17656** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-05-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:17656) - **RHSA-2026:15888** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:15888) - **RHSA-2026:19146** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19146) - **RHSA-2026:19587** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.0) · released 2026-05-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:19587) - **RHSA-2026:17659** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-05-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:17659) - **RHSA-2026:17658** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.4), Red Hat CodeReady Linux Builder EUS (v.9.4) · released 2026-05-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:17658) - **RHSA-2026:17660** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-05-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:17660) - **RHSA-2026:15887** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-05-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:15887) - **RHSA-2026:19359** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19359) - **RHSA-2026:30078** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-06-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:30078) - **RHSA-2026:30089** · Red Hat · fixed in: Red Hat AI Inference Server 3.3 · released 2026-06-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:30089) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json)