{"id":"CVE-2026-31979","summary":"himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache","details":"Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Prior to 3.1.0 and 2.3.8, the himmelblaud-tasks daemon, running as root, writes Kerberos cache files under /tmp/krb5cc_\u003cuid\u003e without symlink protections. Since commit 87a51ee, PrivateTmp is explicitly removed from the tasks daemon's systemd hardening, exposing it to the host /tmp. A local user can exploit this via symlink attacks to chown or overwrite arbitrary files, achieving local privilege escalation. This vulnerability is fixed in 3.1.0 and 2.3.8.","aliases":["GHSA-44wm-q286-ghq3"],"modified":"2026-04-10T18:44:17.061657074Z","published":"2026-03-11T19:47:05.935Z","related":["SUSE-FU-2026:20990-1","openSUSE-FU-2026:20453-1","openSUSE-SU-2026:10328-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31979.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-59"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31979.json"},{"type":"ADVISORY","url":"https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ghq3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31979"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/himmelblau-idm/himmelblau","events":[{"introduced":"d01709bf0100183045927c03b90db78fb8e40bda"},{"fixed":"dec3693cbb151b4686b0d926b95379c71f391b1a"}],"database_specific":{"versions":[{"introduced":"1.0.0"},{"fixed":"2.3.8"}]}},{"type":"GIT","repo":"https://github.com/himmelblau-idm/himmelblau","events":[{"introduced":"cf9255c3ffea77705e9725b18f39d520b3b07f59"},{"fixed":"9079a98b44beb1c4e77215a262b95e6fd44c1dfb"}],"database_specific":{"versions":[{"introduced":"3.0.0-alpha"},{"fixed":"3.1.0"}]}}],"versions":["1.0.0","2.0.0","2.0.0-alpha","2.0.0-beta","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.1.0","2.2.0","2.3.0","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","2.3.7","3.0.0","3.0.0-alpha","3.0.0-beta","3.0.0-beta2","3.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31979.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}