CVE-2026-35563: It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certifica

Routine

HIGH 8.5WATCHLISTUPGRADE

CVE-2026-35563 is a high-severity flaw (CVSS 8.5) affecting directory ldap api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-297
Published	2026-06-01
Last modified	2026-07-22

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-01 08:16 UTCPublished CVE record published
2026-07-22 07:10 UTCUpdated Record last modified

apache directory ldap api UPGRADE

Affected: >= 2.0.0 and < 2.1.7

Fixed in: 2.1.7

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy directory-ldap-api || rpm -q directory-ldap-api || directory-ldap-api --version

2. UPGRADE to 2.1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade directory-ldap-api

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade directory-ldap-api

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison directory-ldap-api sudo apt install directory-ldap-api=<VERSION_BEFORE_2.0.0> sudo apt-mark hold directory-ldap-api

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list directory-ldap-api sudo dnf downgrade directory-ldap-api-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add directory-ldap-api

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35563?

directory ldap api: upgrade to 2.1.7. Exact commands for each OS are on this page.

Is CVE-2026-35563 being exploited?

CVE-2026-35563 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35563 affect?

CVE-2026-35563 affects directory ldap api. Severity is high (CVSS 8.5). 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, th

How urgent is CVE-2026-35563?

Priority 37/100. High severity; On your watchlist

References

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