Vulnerability record · CVE-2026-14940 · published 7 July 2026

CVE-2026-14940: Redhat directory server heap-based buffer overflow vulnerability

Redhat · Directory Server

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.

5.3 CVSS 3.1 Medium EPSS 0.49% · top 60.5% CWE-122 · Heap-based buffer overflow

5.3CVSS 3.1 base score

0.49%EPSS exploitation probability, 30 days

NoNot in CISA KEV

3Affected product versions listed by NVD

2References

9 Jul 2026Last modified by NVD

Description

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

389 Directory Server Redhat

Directory Server Redhat

Enterprise Linux Redhat

References

Link	Tags
https://access.redhat.com/security/cve/CVE-2026-14940	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2497697	Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-14940), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.