{"id":"UBUNTU-CVE-2026-55371","details":"OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_bytes(). The public setter validates the top-level exr_attr_bytes_t value pointer but does not verify that the nested type_hint pointer is non-NULL when hint_length is greater than zero. When a caller supplies a positive hint_length together with a NULL type_hint, exr_attr_bytes_create() allocates a destination type-hint buffer and then copies from the NULL source pointer, causing a deterministic crash. The flaw is reachable through the public OpenEXRCore C API and results in a denial of service. The issue is fixed in version 3.4.13.","modified":"2026-09-02T16:20:01Z","published":"2026-08-25T01:16:00Z","upstream":["CVE-2026-55371"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-55371"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-55371"},{"type":"REPORT","url":"https://github.com/academysoftwarefoundation/openexr/security/advisories/ghsa-xx72-f24p-cf6r"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/55xxx/cve-2026-55371.json"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-55371"}],"affected":[{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-1ubuntu3","2.2.0-7ubuntu1","2.2.0-9ubuntu1","2.2.0-10ubuntu2","2.2.0-10ubuntu2.1","2.2.0-10ubuntu2.2","2.2.0-10ubuntu2.3","2.2.0-10ubuntu2.4","2.2.0-10ubuntu2.6","2.2.0-10ubuntu2.6+esm1","2.2.0-10ubuntu2.6+esm2","2.2.0-10ubuntu2.6+esm3","2.2.0-10ubuntu2.6+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.0-10ubuntu2.6+esm4","binary_name":"libopenexr22"},{"binary_name":"openexr","binary_version":"2.2.0-10ubuntu2.6+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}},{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-11ubuntu1","2.2.0-11.1ubuntu1","2.2.0-11.1ubuntu1.1","2.2.0-11.1ubuntu1.2","2.2.0-11.1ubuntu1.3","2.2.0-11.1ubuntu1.4","2.2.0-11.1ubuntu1.6","2.2.0-11.1ubuntu1.7","2.2.0-11.1ubuntu1.8","2.2.0-11.1ubuntu1.9","2.2.0-11.1ubuntu1.9+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libopenexr22","binary_version":"2.2.0-11.1ubuntu1.9+esm1"},{"binary_name":"openexr","binary_version":"2.2.0-11.1ubuntu1.9+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}},{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1-4.1ubuntu1","2.3.0-6","2.3.0-6build1","2.3.0-6ubuntu0.1","2.3.0-6ubuntu0.2","2.3.0-6ubuntu0.3","2.3.0-6ubuntu0.5","2.3.0-6ubuntu0.5+esm1","2.3.0-6ubuntu0.5+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libopenexr24","binary_version":"2.3.0-6ubuntu0.5+esm2"},{"binary_name":"openexr","binary_version":"2.3.0-6ubuntu0.5+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}},{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.4-2","2.5.7-1","2.5.7-1ubuntu0.1~esm1","2.5.7-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libopenexr25","binary_version":"2.5.7-1ubuntu0.1~esm2"},{"binary_name":"openexr","binary_version":"2.5.7-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}},{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.5-5.1","3.1.5-5.1build1","3.1.5-5.1build2","3.1.5-5.1build3","3.1.5-5.1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.5-5.1ubuntu0.1~esm1","binary_name":"libopenexr-3-1-30"},{"binary_name":"openexr","binary_version":"3.1.5-5.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}},{"package":{"name":"openexr","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/openexr?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.13-2","3.1.13-2build1","3.1.13-2ubuntu0.26.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.13-2ubuntu0.26.04.1~esm1","binary_name":"libopenexr-3-1-30"},{"binary_name":"openexr","binary_version":"3.1.13-2ubuntu0.26.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55371.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}