Dashboard / CVE-2026-18663

CVE-2026-18663

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 62/100
Published: 2026-08-12 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

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.

Weakness Classification (1)

References & Advisories (2)

https://bugzilla.redhat.com/show_bug.cgi?id=2510631
issue-tracking x_refsource_REDHAT

Bug Bounty Relevance

62 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

5.9 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.51%
Raw Score 0.005110
Percentile 44.2%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00511
2026-11-13
0.00511
2026-11-12
0.00511
2026-11-10
0.00511
2026-11-09
0.00511
2026-11-08
0.00511
2026-11-07
0.00511
2026-11-06
0.00511
2026-11-05
0.00511

Intelligence Sources

mitre ref →
nvd ref →

External Links