CVE-2026-11793: 389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-08-07
Weakness: CWE-121

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.

Affected products

Red Hat 389 Directory Server: all versions

References

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

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