{"id":"CVE-2025-3891","summary":"Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled","details":"A flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The server crashes consistently, affecting availability.","aliases":["BIT-apache-2025-3891","GHSA-x7cf-8wgv-5j86"],"modified":"2026-11-06T07:04:51.013401511Z","published":"2025-04-29T11:56:50.808Z","related":["ALSA-2025:4597","ALSA-2025:9396","SUSE-SU-2025:01585-1","SUSE-SU-2025:01953-1","SUSE-SU-2025:01962-1","SUSE-SU-2025:4532-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3891.json","unresolved_ranges":[{"extracted_events":[{"range":[{"fixed":"8100020250426100353.489197e6"},{"fixed":"8020020250612174445.4cda2c84"},{"fixed":"8040020250618101351.522a0ee4"},{"fixed":"8060020250617090503.ad008a3a"},{"fixed":"8060020250617090503.ad008a3a"},{"fixed":"8060020250617090503.ad008a3a"},{"fixed":"8080020250617090716.63b34585"},{"fixed":"8080020250617090716.63b34585"},{"fixed":"0:2.4.10-1.el9_6.2"},{"fixed":"0:2.4.9.4-1.el9_0.3"},{"fixed":"0:2.4.9.4-1.el9_2.3"},{"fixed":"0:2.4.9.4-4.el9_4.2"}],"source":"AFFECTED_FIELD","strategy":"InverseAffectedRanges"}]}],"cna_assigner":"redhat","cwe_ids":["CWE-248"]},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00007.html"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10002"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10003"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10004"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10006"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10007"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10008"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:10010"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:4597"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:9396"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2025-3891"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/3xxx/CVE-2025-3891.json"},{"type":"ADVISORY","url":"https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-x7cf-8wgv-5j86"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-3891"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2361633"},{"type":"FIX","url":"https://github.com/OpenIDC/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b"},{"type":"PACKAGE","url":"https://github.com/OpenIDC/mod_auth_openidc"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openidc/mod_auth_openidc","events":[{"introduced":"4fe40bd8bed0c7697f4fb2c3733d02d472cb849e"},{"fixed":"5050a96dca441a921c95521bff6e47caa40c750b"},{"fixed":"6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"2.0.0"},{"fixed":"2.4.13.1"}],"source":"AFFECTED_FIELD"},{"range":[{"fixed":"6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["v2.4.13","v2.4.12.3","v2.4.12.2","v2.4.12.1","v2.4.12","v2.4.11.3","v2.4.11.2","v2.4.11.1","v2.4.11","v2.4.10","v2.4.9.4","v2.4.9.3","v2.4.9.2","v2.4.9.1","v2.4.9","v2.4.8.4","v2.4.8.3","v2.4.8.2","v2.4.8.1","v2.4.7.2","v2.4.7.1","v2.4.7","v2.4.6","v2.4.5","v2.4.4.1","v2.4.4","v2.4.3","v2.4.2.1","v2.4.2","v2.4.1","v2.4.0.4","v2.4.0.3","v2.4.0.2","v2.4.0.1","v2.4.0","v2.3.11","2.3.11rc1","v2.3.10.2","v2.3.10.1","v2.3.10","v2.3.9","v2.3.8","v2.3.7","v2.3.6","v2.3.5","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.3.0rc3","v2.3.0rc0","v2.2.0","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-3891.json","vanir_signatures":[{"source":"https://github.com/openidc/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b","target":{"file":"src/mod_auth_openidc.c","function":"oidc_original_request_method"},"deprecated":false,"digest":{"function_hash":"211198591416651378099077896614660068044","length":663},"id":"CVE-2025-3891-0cdcbe7c","signature_type":"Function","signature_version":"v1"},{"digest":{"line_hashes":["239289886643070125605459760189440756043","229876794043611023403253123313672969009","263559125609405718920736118279668036461","44104131586549595805645968922353939301"],"threshold":0.9},"id":"CVE-2025-3891-4b8990d0","signature_type":"Line","signature_version":"v1","source":"https://github.com/openidc/mod_auth_openidc/commit/6a0b5f66c87184dfe0e4400f6bdd46a82dc0ec2b","target":{"file":"src/mod_auth_openidc.c"},"deprecated":false},{"id":"CVE-2025-3891-8d12588a","signature_type":"Line","signature_version":"v1","source":"https://github.com/openidc/mod_auth_openidc/commit/5050a96dca441a921c95521bff6e47caa40c750b","target":{"file":"src/jose.c"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["64978875816620747788720445007160513623","271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