8.8

CVE-2026-35563: apache software foundation apache directory ldap api

CVSS: 8.8v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-35563DEBIAN-CVE-2026-35563GHSA-85rw-g4f4-jprr
Published 01-06-2026Last modified 01-06-2026
Open JSON

Vulnerability summary

CVE-2026-35563 is a high (CVSS 8.8) vulnerability in apache software foundation apache directory ldap api. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v4.0 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 01-06-2026
    PublishedVulnerability first disclosed.
  2. 01-06-2026
    Last modifiedVulnerability information updated.

Description

It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certificate matches the intended LDAP hostname. While the underlying code validates the certificate chain against a trusted authority, the absence of endpoint identification allows a valid certificate issued for an entirely unrelated host to be improperly accepted. This oversight leaves the connection highly vulnerable to server impersonation and complete connection compromise. The root cause of this vulnerability lies in the incomplete TLS server identity verification within the LDAP client implementation. The attacker requires MITM capability on the network to exploit this vulnerability. This attacker must be able to present a certificate trusted by the client's configured trust store. The hostname verification has been enforced in the new version of the LDAP API

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

+0.08 pp

From 0.18% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.26%

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

Apache1 product
Apache software foundation1 product
Debian1 product
  • apache-directory-apiAll versions (No fix recorded)
Org.apache.directory.api1 product
  • api-ldap-client-api≥ 2.0.0, < 2.1.8
Ubuntu1 product
  • apache-directory-apiAll versions (No fix recorded)

5 vendors · 5 products

References

9 links