CVE-2026-103547

LDAP Authentication Bypass via Reused File Descriptor and Message ID in OpenBSD ldapd

Published Sep 30, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Title LDAP Authentication Bypass via Reused File Descriptor and Message ID in OpenBSD ldapd
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.)
First Time appeared Openbsd
Openbsd openbsd
Weaknesses CWE-863
CPEs cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
Vendors & Products Openbsd
Openbsd openbsd
References
Metrics cvssV4_0

{'score': 9.2, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 30, 2026, 7:55 PM
Reserved
Sep 30, 2026, 7:40 PM
Status
Deferred
Published
Sep 30, 2026, 8:17 PM
Modified
Oct 1, 2026, 3:07 PM