CVE-2026-18663
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
A double-free flaw was found in 389-ds-base in the get_ldapmessage_controls_ext() function. An unauthenticated remote attacker can trigger it with a single BIND request carrying a critical Session Tracking control, leading to heap corruption and potential denial of service.
Risk Assessment
An attacker can remotely crash the directory service, potentially disrupting systems relying on 389-ds-base.
Recommendation
Apply available patches for 389-ds-base and restrict access to the service to trusted networks only.
Original NVD description (English source)
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array on the Session Tracking critical-control rejection path without clearing the SLAPI_REQCONTROLS pblock slot. Operation teardown then frees the same pointer again, causing a double-free. An unauthenticated remote attacker can trigger this with a single BIND request carrying a critical Session Tracking control, resulting in heap corruption and potential denial of service.