{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86345", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-09-07T09:14:21.954Z", "datePublished": "2026-10-01T23:27:47.752Z", "dateUpdated": "2026-10-01T23:27:47.752Z"}, "containers": {"cna": {"title": "389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Directory Server 11", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:directory_server:11"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 11", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11/389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:directory_server:11"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 12", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:directory_server:12"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 12", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:12/389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:directory_server:12"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 13", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:directory_server:13"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "unknown", "cpes": ["cpe:/o:redhat:enterprise_linux:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "unknown", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds:1.4/389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "389-ds-base", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:9"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-86345", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2529332", "name": "RHBZ#2529332", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-10-01T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-923", "description": "Improper Restriction of Communication Channel to Intended Endpoints", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-923: Improper Restriction of Communication Channel to Intended Endpoints", "workarounds": [{"lang": "en", "value": "Disable StartTLS on port 389 and require ldaps:// (port 636) instead, which has no cleartext prefix to inject into. No configuration-only mitigation fully closes the issue on port 389 while StartTLS remains enabled."}], "timeline": [{"lang": "en", "time": "2026-09-02T05:13:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-01T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank xclow3n for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-01T23:27:47.752Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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