{"schemaVersion":3,"id":"CVE-2026-11850","aliases":["SUSE-SU-2026:22450-1","SUSE-SU-2026:22702-1","SUSE-SU-2026:2847-1","SUSE-SU-2026:2849-1","SUSE-SU-2026:2954-1","RHSA-2026:25520","UBUNTU-CVE-2026-11850","DEBIAN-CVE-2026-11850","openSUSE-SU-2026:11177-1","openSUSE-SU-2026:21238-1"],"status":"published","duplicateOf":null,"title":null,"description":"An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read.\nThe attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len < 2, triggering the underflow when the KDC or kadmind reads principal data.","dates":{"published":"2026-06-11T09:49:07.726Z","modified":"2026-08-31T17:33:51.523Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Red 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