CVE catalog
CVE-2026-73253
DEBIAN-CVE-2026-73253
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mongoose | 14 | 7.21+ds-1 | vulnerable |
| Debian | mongoose | 14 | 7.21+ds-1~bpo13+1 | vulnerable |
| Debian | mongoose | 14 | 7.21+ds-2 | vulnerable |
| Debian | mongoose | 14 | 7.22+ds-1~bpo13+1 | vulnerable |
| Debian | mongoose | 14 | 7.22+ds-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mongoose | deb | 14 | 7.22+ds-1 | Not reported | DEBIAN-CVE-2026-73253 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: