Vulnerability · Published Oct 26, 2026 · Assigned by GitHub_M
CVE-2026-57193Asterisk: LDAP Filter Injection in res_config_ldap via SIP Username (Unauthenticated Information Disclosure)
Medium 6.9
In plain English
A medium-severity security flaw in asterisk from asterisk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | asterisk | 1:22.10.1+dfsg+~cs6.17.60671434-1 | DEBIAN-CVE-2026-57193 |
| Ubuntu:22.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57193 |
| Ubuntu:24.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57193 |
| Ubuntu:26.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57193 |
| Ubuntu:26.10 | asterisk | no fix listed | UBUNTU-CVE-2026-57193 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| asterisk | asterisk | < 20.20.1>= 21.0.0-pre1, < 21.12.3>= 22.0.0-pre1, < 22.10.1>= 23.0.0-pre1, < 23.4.1 |
| asterisk | certified-asterisk | < 20.7-cert11>= 22.8-cert1-pre1, < 22.8-cert3 |
Weakness: CWE-943 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/asterisk/asterisk/security/advisories/GHSA-r6c2-hwc2-j4mp x_refsource_CONFIRM
- https://github.com/asterisk/asterisk/commit/04aa482212e43b292817444eb4de35499f4b1568 x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/14968f2f440ea0dd983caa4f477237a5224904dd x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/23c01b6d359c5d85da725beea89e394a6c031c5d x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/7e1ae09594a101950398cc6aff2dd2e5ab314884 x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/8170a6bfa75994e7617a8b9d7fe7a7140b70cbe2 x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/dd0c768d9e9678e4cb1ed95689a254a61452239b x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/ef280572a034cac3994075298facb1999778ee0d x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/20.20.1 x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/21.12.3 x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/22.10.1 x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/23.4.1 x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 x_refsource_MISC
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1 x_refsource_MISC