Medium severity · published Jul 7, 2026
CVE-2026-14940
389-ds-base: 389-ds-base: heap-buffer-overflow in dn normalization via quoted multivalued rdn
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Directory Server 11 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Directory Server 12 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Directory Server 13 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
3D
389 Directory Server · Redhat
All versions, or not specified · source: NVD
DS
Directory Server · Redhat
11.0; 12.0; 13.0 · source: NVD
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0; 10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14940
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14940
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-14940
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2497697
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