CVE-2026-14940

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-07-07

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.

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Exploitation outlook

Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-14940: A heap-buffer-overflow flaw was found in 389 Directory Server (389-ds-base). When normalizing …nvd · 2026-07-07

External references

NVD record for CVE-2026-14940

CVE.org record

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