{"id":"CVE-2026-86344","title":"A flaw was found in 389-ds-base","summary":"A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a secon…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"vendor":"Red Hat","product":"389-ds-base","affected":["389-ds-base (all versions)","redhat-ds:11/389-ds-base (all versions)","389-ds-base (all versions)","redhat-ds:12/389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base","389-ds-base","389-ds:1.4/389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)"],"published":"2026-10-01","updated":"2026-10-02","sourceUpdated":"2026-10-02T19:16:42.620","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86344","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-86344","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529329","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86344.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86344"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86344"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-02T18:22:37.897462Z"},"epss":0.00347,"epssPercentile":0.28151,"ingestedAt":"2026-10-01T23:03:32.781Z","slug":"CVE-2026-86344","body":"## Overview\n\nA flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.\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 Directory Server 11, Red Hat Directory Server 12, Red Hat Directory Server 13, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Red Hat Directory Server 11, Red Hat Directory Server 12, Red Hat Directory Server 13, Red Hat Enterprise Linux 10, … · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86344.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}