CVE-2026-11793

Name: CVE-2026-11793
Creator: NVD / NIST
Published: 2026-06-09T14:16:37.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2026-11793 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

Metrics

CVSS 3.1

4.9/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.33%

25.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-121

Affected Software

Vendor	Product	Versions
Redhat	389 Directory Server	All versions

References

https://access.redhat.com/security/cve/CVE-2026-11793Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2484914Issue Tracking, Vendor Advisory
https://redhat.atlassian.net/browse/PSIRTSUPT-7600Permissions Required

Timeline

Published: Jun 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-11793?

How severe is CVE-2026-11793?

CVE-2026-11793 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2026-11793?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-11793?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST