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CVE-2026-103547

Quick assessment

Affected
OpenBSD OpenBSD
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.

在 OpenBSD 7.8（errata 057 之前）和 7.9（errata 021 之前）中的 ldapd 服务中，委托的 BSD 认证结果仅通过 LDAP 子进程的客户端文件描述符和 LDAP 消息 ID 进行关联。当连接关闭后，后续重用相同文件描述符和消息 ID 的新连接可能会接收到之前已完成的认证结果。能够访问 ldapd 的远程攻击者可以利用此缺陷，以其他身份完成 Bind（绑定）操作。此外，连接缺失还可能导致空指针解引用漏洞。（注意：ldapd 默认未启用。）

CVSS 9.2 · Critical
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I. Basic Information for CVE-2026-103547

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In ldapd in OpenBSD 7.8 before errata 057 and 7.9 before errata 021, delegated BSD authentication results are correlated only by the LDAP child process client file descriptor and LDAP message ID. After a connection closes, a later connection that reuses the same file descriptor and message ID can receive the earlier authentication result. A remote attacker who can reach ldapd can complete a Bind as another identity. A missing connection can also cause a NULL pointer dereference. (ldapd is not enabled by default.)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenBSD OpenBSD 7.8 ~ errata 057 -

II. Public POCs for CVE-2026-103547

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III. Intelligence Information for CVE-2026-103547

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Vendor Advisories for CVE-2026-103547 (1)

Other References for CVE-2026-103547 (3)

IV. Related Vulnerabilities

Same product: OpenBSD
Same vendor: OpenBSD
Same weakness: CWE-863

V. Comments for CVE-2026-103547

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