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CVE-2026-35563— Apache Directory LDAP API: LDAP client implementation does not verify if the server certificate matches the intended LDAP hostname

Quick assessment

Affected
Apache Software Foundation Apache Directory LDAP API
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Directory LDAP API是美国阿帕奇（Apache）基金会的一个LDAP协议开发框架。 Apache Directory LDAP API 2.0.0版本至2.1.7版本存在安全漏洞，该漏洞源于TLS服务器身份验证不完整，未验证服务器证书是否与预期LDAP主机名匹配，可能导致中间人攻击者通过呈现受信任证书实现服务器冒充和连接完全破解。

AI Predicted 7.4 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Directory LDAP API 2.0.0≤ 2.1.7 affected
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I. Basic Information for CVE-2026-35563

Vulnerability Information
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Vulnerability Title
Apache Directory LDAP API: LDAP client implementation does not verify if the server certificate matches the intended LDAP hostname
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Directory LDAP API 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Directory LDAP API是美国阿帕奇（Apache）基金会的一个LDAP协议开发框架。 Apache Directory LDAP API 2.0.0版本至2.1.7版本存在安全漏洞，该漏洞源于TLS服务器身份验证不完整，未验证服务器证书是否与预期LDAP主机名匹配，可能导致中间人攻击者通过呈现受信任证书实现服务器冒充和连接完全破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Directory LDAP API 2.0.0 ~ 2.1.7 -

II. Public POCs for CVE-2026-35563

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III. Intelligence Information for CVE-2026-35563

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Mailing List Discussions for CVE-2026-35563 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-01 · 28 CVEs total

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Showing top 20 of 28 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: Apache Software Foundation
Same weakness: CWE-297

V. Comments for CVE-2026-35563

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