{"apiVersion":"1.0","identifier":"CVE-2026-73253","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.","publishedAt":"2026-08-20T18:16:45","lastModifiedAt":"2026-08-20T19:17:01","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73253","cvssScore":9.1,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.00212,"riskScore":0.93,"affectedProduct":"Mongoose","affectedVersions":"<7.22","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73253","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73253","en":"https://www.redsauce.net/en/cves/CVE-2026-73253","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73253","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73253","de":"https://www.redsauce.net/de/cves/CVE-2026-73253","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73253","el":"https://www.redsauce.net/el/cves/CVE-2026-73253"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73253"}}