CVE-2026-103547

critical

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.)

References

https://www.openbsd.org/errata79.html

https://www.openbsd.org/errata78.html

https://github.com/openbsd/src/commit/4f3f58e83c2a6d239c544236a9d4d76c74bbf960

https://ftp.openbsd.org/pub/OpenBSD/patches/7.9/common/021_ldapd.patch.sig

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90259

Details

Source: Mitre, NVD

Published: 2026-09-30

Updated: 2026-10-01

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base 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

Severity: Critical

EPSS

EPSS: 0.00603