CVE-2026-103547

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.)

CVSS 4.0

9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWE

CWE-863

Published

2026-09-30

Modified

2026-10-01

Record from

the NVD, synced 2026-10-19

References

• https://ftp.openbsd.org/pub/OpenBSD/patches/7.9/common/021_ldapd.patch.sig
• https://github.com/openbsd/src/commit/4f3f58e83c2a6d239c544236a9d4d76c74bbf960
• https://www.openbsd.org/errata78.html
• https://www.openbsd.org/errata79.html

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