How severe is CVE-2026-35563?

CVE-2026-35563 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35563?

CVE-2026-35563 affects Apache Directory Ldap Api. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35563?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35563 have an EU (EUVD) identifier?

Yes. CVE-2026-35563 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33569.

When was CVE-2026-35563 published?

CVE-2026-35563 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-35563

CVE-2026-35563 is a high-severity vulnerability in Apache Directory Ldap Api with a CVSS 3.x base score of 8.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-297.

Key facts

Severity: High (CVSS 3.x base score 8.5)
CVSS v4: 8.8
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33569
Weakness: CWE-297
Affected product: Apache Directory Ldap Api
Published: 2026-06-01
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2026-35563?: 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
How severe is CVE-2026-35563?: CVE-2026-35563 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35563?: CVE-2026-35563 affects Apache Directory Ldap Api. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35563?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35563 have an EU (EUVD) identifier?: Yes. CVE-2026-35563 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33569.
When was CVE-2026-35563 published?: CVE-2026-35563 was published on 2026-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:directory_ldap_api:*:*:*:*:*:*:*:*

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