No exploitation reportedFix available

CVE-2026-15722

389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing

No exploitation reported by the sources we read.

Published2026-07-31
WeaknessCWE-121

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service.

Timeline

dates in UTC

2026-07-3110:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-15722?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-15722?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
7.0	= 7.0	no fix published	NVD
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD

Redhat directory server

Branch	Affected	Fixed in	Source
12.0	= 12.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD

Redhat 389 directory server

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

389-ds-baseAlmaLinux:10all versions · fixed in 3.2.0-9.el10_2and 5 other packages
389-ds-baseAlmaLinux:9all versions · fixed in 2.8.0-9.el9_8and 4 other packages
389-ds-baseAlmaLinux:8all versions · fixed in 1.4.3.39-26.module_el8.10.0+4254+e9c4b400and 5 other packages

Vendor advisories

CVE-2026-15722 Red Hat Product Security485 products fixed · 5 known affected
389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica ID parsing
redhat-ds:12/389-ds-base.src as a component of Red Hat Directory Server 12 · 389-ds-base as a component of Red Hat Enterprise Linux 6 · 389-ds-base-devel as a component of Red Hat Enterprise Linux 6 · +2 more
RHSA-2026:79217 Red Hat Product Security13 products fixed
Red Hat Security Advisory: redhat-ds:11 security, bug fix, and enhancement update
RHSA-2026:56050 Red Hat Product Security11 products fixed
Red Hat Security Advisory: redhat-ds:12 security update
RHSA-2026:56048 Red Hat Product Security11 products fixed
Red Hat Security Advisory: redhat-ds:12 security update
RHSA-2026:56047 Red Hat Product Security13 products fixed
Red Hat Security Advisory: redhat-ds:11 security update
RHSA-2026:55794 Red Hat Product Security34 products fixed
Red Hat Security Advisory: 389-ds:1.4 security update

11 more advisories

Full record on NVD

Fix

Vendor fix Red Hat Product Security RHSA-2026:79217 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround from the vendor Red Hat Product Security RHSA-2026:79217 · 13 productsDisable anonymous access by setting nsslapd-allow-anonymous-access to 'off' or 'rootdse' in cn=config. Alternatively, restrict network access to the LDAP port to trusted replication partners only using firewall rules.

Advisories and patches

access.redhat.comVendor Advisory
bugzilla.redhat.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-07-31
OpenCVESSVC decisionnone—
CNACVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-121read 2026-10-23
FIRST EPSSEPSS score0.8 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-07-31
Last Modified: 2026-10-08
NVD status: Modified

Frequently asked questions

What is CVE-2026-15722?

Is CVE-2026-15722 actively exploited?

Active exploitation of CVE-2026-15722 has not been confirmed. Its EPSS score was 0.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-15722?

CVE-2026-15722 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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