CVE-2026-14940

A heap-buffer-overflow flaw was found in 389 Directory Server (389-ds-base). When normalizing a Distinguished Name (DN) that contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), the server can write past the end of a heap allocation while sorting RDN attribute-value pairs. An unauthenticated remote attacker can trigger this condition by sending an LDAP operation whose DN reaches the DN normalization routine, such as a search with a crafted base DN. This can corrupt heap memory and may cause denial of service.

Score

CVSS 3.1 5.3 Medium

Status

Analyzed - secalert@redhat.com

Published

2026-07-07

Last modified

2026-07-07

Weaknesses

CWE-122

Affected products

• 389 Directory Server (Redhat)
• Directory Server (Redhat)
• Enterprise Linux (Redhat)

References

• https://access.redhat.com/security/cve/CVE-2026-14940
• https://bugzilla.redhat.com/show_bug.cgi?id=2497697