CVE-2026-13608 OpenLDAP SASL authentication bypass
A flaw in libcurl's SASL negotiation allows MITM attackers to bypass LDAP authentication by injecting premature responses, compromising secure connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-13608?
CVE-2026-13608 is a high-severity authentication bypass vulnerability in Haxx Curl, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.
Weakness: CWE-923
Which versions are affected by CVE-2026-13608?
It affects 1 product.
Products include Haxx Curl.
How do I fix CVE-2026-13608?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-13608 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13608 exists.
Other vulnerabilities in Haxx Curl
Sources
Also known as ALPINE-CVE-2026-13608, AZL-99762, AZL-99786, AZL-99813, AZL-99822, AZL-99861 and 15 more.