9.1
Critical
CVE-2026-73253 Mongoose is an embedded web server and network library
Description
Mongoose is an embedded web server and network library. Prior to version 7.22, an on-path network attacker with a wildcard certificate for a parent domain can impersonate deeper subdomains to a client using the built-in TLS stack. The mg_tls_verify_cert_san() and mg_tls_verify_cert_cn() functions in src/tls_builtin.c call mg_match(), whose wildcard can cross DNS label boundaries, so a pattern such as *.example.com can match foo.bar.example.com. The resulting hostname verification bypass permits interception and modification of TLS traffic. This issue is fixed in version 7.22.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Mongoose 7.22 | earliest → < 7.22 | 7.22 |
Other CVEs of Mongoose
The 38 CVEs of Mongoose →
CVE-2026-115473
Mongoose: Heap OOB reads and null-byte bypass in mg_path_is_sane (util.c)
6.5
Medium
CVE-2026-63626
Mongoose is an embedded web server and network library
8.8
High
CVE-2026-73261
Mongoose is an embedded web server and network library
7.5
High
CVE-2026-73260
Mongoose is an embedded web server and network library
7.5
High