CVE-2026-86345
CRITICAL
INFO
Priority: 0.03
BB Relevance:
68/100
Published: 2026-10-01
Modified: 2026-11-07
First seen: 2026-11-06
Status: active
Attack Surface
Network
No Auth
No Interaction
Conf. Impact
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
None
S:
Changed
C:
High
I:
High
A:
High
Description
A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.