CVE-2026-11793 — MEDIUM (4.9)

Vulnerability 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.

CVSS Score

4.9

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Redhat	389 Directory Server	-

Related Weaknesses (CWE)

CWE-121

References

https://access.redhat.com/security/cve/CVE-2026-11793Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2484914Issue TrackingVendor Advisory

FAQ

What is CVE-2026-11793?

CVE-2026-11793 is a vulnerability with a CVSS score of 4.9 (MEDIUM). 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 ...

How severe is CVE-2026-11793?

CVE-2026-11793 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-11793?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat 389 Directory Server.