Critical [CVE-2026-86345] StartTLS plaintext-buffer retention allows on-path attacker to forge an LDAP client's authentication result
This critical-severity Red Hat Linux advisory covers CVE-2026-86345; related products: Red Hat Directory Server 11, Red Hat Directory Server 12, Red Hat Directory Server 13.
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Summary
StartTLS plaintext-buffer retention allows on-path attacker to forge an LDAP client's authentication result. Red Hat rates this moderate (CVSS 9).
Weakness: CWE-923.
Affected products named by the advisory: Red Hat Directory Server 11; Red Hat Directory Server 12; Red Hat Directory Server 13; Red Hat Enterprise Linux 10; and 2 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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