CVE-2026-86345 389-ds-base - Authentication Bypass

389-ds-base contains a broken authentication caused by improper handling of buffered plaintext bytes during StartTLS negotiation, letting on-path attackers inject crafted LDAP messages causing authentication bypass, exploit requires man-in-the-middle position.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2 October 2026
Updated
15 October 2026
Weakness
CWE-923

Vendor fix

Update to the latest version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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