mongoose: Mongoose is an embedded web server and network library
CVE-2026-73253 is fixed in mongoose on 1 platform by DEBIAN-CVE-2026-73253 (version 7.22+ds-1), released August 21, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongoose · Debian 14 | 7.22+ds-1 | DEBIAN-CVE-2026-73253 | Aug 21, 2026 |
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