CVE-2026-11789: 389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-07-23
Weakness: CWE-191

Description

A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.

Affected products

Red Hat 389 Directory Server: all versions
RedHat Directory Server: 11.0, 12.0, 13.0
Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0

References

https://access.redhat.com/security/cve/CVE-2026-11789
https://bugzilla.redhat.com/show_bug.cgi?id=2485422

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