--- id: CVE-2026-34588 title: >- OpenEXR: OpenEXR: Arbitrary code execution and information disclosure via crafted EXR file (CVE-2026-34588) summary: >- A flaw was found in OpenEXR, an image storage format for the motion picture industry. A remote attacker could exploit an integer overflow vulnerability in the `internal_exr_undo_piz()` function by providing a specially crafted EXR file. Th… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H' cvssSource: vendor cwe: - CWE-190 - CWE-125 - CWE-787 vendor: Red Hat product: Red Hat Enterprise Linux AppStream (v. 9) affected: - enterprise_linux 6 - enterprise_linux 7 - 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 - openshift_ai 3.4 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 - openshift_ai 3.4 published: '2026-04-06' updated: '2026-10-02' sourceUpdated: '2026-10-02T02:06:34+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json' references: - 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://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hf - 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://access.redhat.com/errata/RHSA-2026:74674' - 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://github.com/AcademySoftwareFoundation/openexr' tags: - csaf - vex - red-hat - cve.org - osv - pip epss: 0.00482 epssPercentile: 0.41378 aliases: - GHSA-588r-cr5c-w6hf - PYSEC-2026-2845 ecosystem: pip ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-04-07T03:56:04.356566Z' scores: vendor: 8.8 cna: 8.6 ingestedAt: '2026-07-13T18:57:53.072Z' --- ## Overview A flaw was found in OpenEXR, an image storage format for the motion picture industry. A remote attacker could exploit an integer overflow vulnerability in the `internal_exr_undo_piz()` function by providing a specially crafted EXR file. This flaw leads to out-of-bounds reads and writes, which may allow for arbitrary code execution or sensitive information disclosure. ## 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 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json) **OpenEXR: OpenEXR: Arbitrary code execution and information disclosure via crafted EXR file** — rated Important by Red Hat. Released 2026-04-06, updated 2026-10-02. Affected: - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 Fixed: - Red Hat Enterprise Linux AppStream EUS (v. 10.0) - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream E4S (v.9.0) - Red Hat Enterprise Linux AppStream E4S (v.9.2) - Red Hat Enterprise Linux AppStream EUS (v.9.4) - Red Hat Enterprise Linux AppStream EUS (v.9.6) - Red Hat Enterprise Linux AppStream (v. 9) - Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) - Red Hat CodeReady Linux Builder EUS (v.9.4) - Red Hat CodeReady Linux Builder EUS (v.9.6) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) - Red Hat AI Inference Server 3.3 - Red Hat OpenShift AI 3.4 No fix planned: - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 Not affected: - Red Hat Enterprise Linux 8 ## Remediation For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:17656 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:15888 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:19146 Workarounds / mitigations: - Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. ## 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