CVE-2026-18663
CVE-2026-18663: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium5.9
Medium [CVE-2026-18663] pre-authentication double-free in get_ldapmessage_controls_ext via critical Session Tracking control
CVE-2026-18663Source published Source updated
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. Red Hat rates this issue as Moderate severity primarily because the exploitation requires sending an unauthenticated BIND request with a critical Session Tracking control, but on RHEL 10 and RHDS 13 the ns-slapd process uses jemalloc, which absorbs the double-free without crashing. Live testing confirmed the error…
- Affected products in this advisory
- Red Hat Directory Server 13
- Red Hat Enterprise Linux 10
- Red Hat package: 389-ds-base
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- On builds that include upstream Issue 7389 (committed 2026-04-09, present in 389-ds-base-3.2 branch), administrators can add the Session Tracking control OID (1.3.6.1.4.1.21008.108.63.1) to the ds-ignored-control-criticality configuration attribute. This causes the server to ignore the criticality flag on this control, preventing the vulnerable rejection path from being reached. Additionally, network-level restriction of access to the LDAP port (389/636) to trusted clients reduces exposure.
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