{"id":"CVE-2026-55373","summary":"OpenEXR: OpenEXRUtil SampleCountChannel endEdit() can loop forever on UINT_MAX sample counts","details":"OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12, and 3.4.13 contain an infinite-loop vulnerability in SampleCountChannel. The helper roundListSizeUp() rounds a sample-list size up to the next power of two using repeated unsigned left shifts, which terminates for normal values but fails for UINT_MAX: the sequence reaches 0x80000000, and the next left shift wraps the 32-bit value to 0. Because 0 remains less than UINT_MAX, the loop never progresses and never exits. The bug is reachable through public OpenEXRUtil APIs, either by editing the sample-count buffer through SampleCountChannel::Edit (whose destructor calls endEdit()) or by calling SampleCountChannel::set(x, y, UINT_MAX) on a valid pixel. This issue has been fixed in versions 3.2.10, 3.3.12, and 3.4.13.","aliases":["GHSA-mff9-68x3-h8rh"],"modified":"2026-08-27T11:31:12.090114779Z","published":"2026-08-25T00:39:45.185Z","related":["SUSE-SU-2026:22653-1","SUSE-SU-2026:3169-1","openSUSE-SU-2026:11218-1","openSUSE-SU-2026:21336-1"],"database_specific":{"cwe_ids":["CWE-190","CWE-400","CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55373.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-mff9-68x3-h8rh"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55373.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55373"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/academysoftwarefoundation/openexr","events":[{"introduced":"0"},{"fixed":"821935abdf05db156841b692a1deb8d6f48ffd0a"},{"introduced":"c7d3eac70ccde2c4ed484c6638b83ba872f71464"},{"fixed":"d1dcb760459e6cf9985b98deb118abc6de12f9bb"},{"introduced":"20a65852895894434bea88613f6d29ac8e88bd6e"},{"fixed":"c1194b2cb23a1bdf76fe5e756b22e8436b9a98c9"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.2.10"},{"introduced":"3.3.0"},{"fixed":"3.3.12"},{"introduced":"3.4.0"},{"fixed":"3.4.13"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.2.9-rc","v3.2.9","v3.3.11-rc3","v3.3.11","v3.4.13-rc2","v3.4.13-rc","v3.4.12","v3.4.12-rc2","v3.4.11-rc3","v3.4.11","v3.4.11-rc2","v3.4.11-rc","v3.4.10-rc","v3.4.10","v3.3.10-rc2","v3.3.10","v3.2.8-rc","v3.2.8","v3.3.10-rc","v3.2.7-rc","v3.2.7","v3.3.9-rc2","v3.3.9","v3.4.9","v3.3.9-rc","v3.2.6-rc","v3.2.6","v3.3.8-rc","v3.3.8","v3.4.9-rc","v3.4.8-rc","v3.4.8","v3.4.7","v3.4.7-rc","v3.4.6","v3.4.6-rc","v3.2.5-rc","v3.2.5","v3.3.7-rc4","v3.3.7","v3.4.5","v3.4.5-rc","v3.3.7-rc3","v3.3.7-rc2","v3.3.7-rc","v3.3.6","v3.4.4-rc2","v3.4.4","v3.4.4-rc","v3.4.3-rc3","v3.4.3","v3.3.6-rc4","v3.3.6-rc3","v3.4.3-rc2","v3.2.4-rc2","v3.2.4","v3.3.6-rc2","v3.4.3-rc","v3.3.6-rc","v3.3.5","v3.4.2-rc2","v3.4.2","v3.4.2-rc","v3.4.1-rc2","v3.4.1","v3.4.1-rc","v3.4.0","v3.3.5-rc3","v3.3.5-rc","v3.3.4-rc","v3.3.4","v3.3.3-rc1","v3.3.3","v3.3.3-rc","v3.3.2-rc4","v3.3.2","v3.3.2-rc3","v3.3.2-rc2","v3.3.2-rc","v3.3.1-rc","v3.3.1","v3.3.0-rc2","v3.3.0","v3.2.4-rc","v3.2.3-rc2","v3.2.3","v3.2.3-rc","v3.2.2","v3.2.2-rc2","v3.2.2-rc","v3.2.1-rc","v3.2.1","v3.2.0-rc4","v3.2.0","v3.2.0-rc3","v3.2.0-rc2","v3.2.0-rc","v3.0.0-beta","v2.5.0","v2.4.0","v2.4.0-beta.1","v2.3.0","v2.1.0","v2.0.1","v2.0.0.GM","v2.0.0","v1.7.1","OPENEXR_1_0_4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55373.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}