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🛡️ CVE-2026-14940 — 389-directory-server

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-122 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2026-14940 is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

CVE-2026-14940 is recorded against 3 packages.

  • 389-directory-server
  • directory-server
  • enterprise-linux

Timeline and source

Published on 7 July 2026 and last revised on 9 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

access.redhat.com
bugzilla.redhat.com

Other advisories for this package

389-directory-server has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-122: Heap-based Buffer Overflow) in other software:

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-122
Public Exploit ✅ No
Source NVD
Published 2026-07-07
Updated 2026-08-20
Modified 2026-07-09
Fix URL N/A

Affected Packages

Software From version Fixed in
389-directory-server — —
directory-server — —
enterprise-linux — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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