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Fencer Vulns
medium 5.3

CVE-2026-16560 json

389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued rdn

published 2026-07-22 3 mo ago modified 2026-11-05 3 d ago also EUVD-2026-47661

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a legacy-quoted value, the server won't close the heap allocation allowing another call to refer to the same memory pointer causing a denial of service or an arbitrary memory write operation.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-16560 updated cvss 5.3

389-ds-base: 389-ds-base: heap-buffer-overflow in rdn_av_swap on quoted multivalued RDN

  • Red Hat Directory Server 11 389-ds-base Red Hat Directory Server 12 389-ds-base Red Hat Directory Server 13 389-ds-base Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs Red Hat Enterprise Linux 7 389-ds-base, 389-ds-base-libs, 389-ds-base-snmp Red Hat Enterprise Linux 8 389-ds-base, cockpit-389-ds, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp, 389-ds-base-legacy-tools
    +2 more products
    Red Hat Enterprise Linux 9 389-ds-base, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp Red Hat Enterprise Linux 10 389-ds-base
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Red Hat Red Hat Directory Server 11
  • Red Hat Red Hat Directory Server 12
  • Red Hat Red Hat Directory Server 13
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-1220 Insufficient Granularity of Access Control

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.