7.5

CVE-2026-18453: 389-ds-base NULL Pointer Dereference

CVSS: 7.5v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-18453DEBIAN-CVE-2026-18453
Published 07-09-2026Last modified 08-10-2026
Open JSON

Vulnerability summary

CVE-2026-18453 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in 389-ds-base. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.85%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 4
OPENSUSE-SU-2026:11739-1OPENSUSE-SU-2026:21950-1RHSA-2026:64771RHSA-2026:64776RHSA-2026:64778RHSA-2026:64779

Timeline

  1. 07-09-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

0.00 pp

From 0.85% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • 389-ds-baseAll versions (No fix recorded)
Ubuntu1 product
  • 389-ds-baseAll versions (No fix recorded)

2 vendors · 2 products

References

22 links
Show all 22 references