CVE-2026-57193 Asterisk: LDAP Filter Injection in res_config_ldap via SIP Username (Unauthenticated Information Disclosure)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-57193?
CVE-2026-57193 is a medium-severity vulnerability in asterisk, published on 26 Oct 2026.
Official description
Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, the LDAP realtime driver `res_config_ldap` may permit `LDAP filter injection` through a `SIP username`, allowing an unauthenticated attacker to make arbitrary LDAP queries using carefully crafted SIP packets and disclose information. The `res_config_ldap` module must be loaded and configured to access an LDAP server, which is not the default. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.
Weakness: CWE-943
Which versions are affected by CVE-2026-57193?
How do I fix CVE-2026-57193?
Upgrade to a fixed version.
Is CVE-2026-57193 being exploited?
There is no known exploitation of CVE-2026-57193 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57193, GHSA-r6c2-hwc2-j4mp, UBUNTU-CVE-2026-57193.