{"id":"CVE-2026-103877","title":"Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API.\n\n\n\nA rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java c…","summary":"Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API.\n\n\n\nA rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java c…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"vendor":"Apache Software Foundation","product":"org.apache.directory.api:api-ldap-schema-data","affected":["org.apache.directory.api:api-ldap-schema-data >= 2.1.0 < 2.1.9"],"published":"2026-10-02","updated":"2026-10-07","sourceUpdated":"2026-10-07T23:16:58.850","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103877","references":[{"url":"https://lists.apache.org/thread.html/sys8l881blqfgoc3o724jl32bmjl8pvw","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/02/5","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103877.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-103877"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544997"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-103877"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103877"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00469,"epssPercentile":0.40435,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-07T20:54:06.776749Z"},"scores":{"nvd":9.8,"vendor":8.1,"adp":9.8},"ingestedAt":"2026-10-02T10:15:55.897Z","slug":"CVE-2026-103877","body":"## Overview\n\nDeserialization of Untrusted Data vulnerability in Apache Directory LDAP API.\n\n\n\nA rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE. \n\n\n\nThis issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9.\n\n\n\nUsers are recommended to upgrade to version 2.1.9, which fixes the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Fuse 7 · no fix planned: Red Hat Fuse 7 · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103877.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":217837,"id":"CVE-2026-103877","ts":1791417686138,"field":"cvss","old":"8.1","new":"9.8"},{"seq":217836,"id":"CVE-2026-103877","ts":1791417686138,"field":"severity","old":"high","new":"critical"},{"seq":215240,"id":"CVE-2026-103877","ts":1791014452909,"field":"cvss","old":null,"new":"8.1"},{"seq":215239,"id":"CVE-2026-103877","ts":1791014452909,"field":"severity","old":"none","new":"high"}]}