{"apiVersion":"1.0","identifier":"CVE-2026-73251","description":"Mongoose is an embedded web server and network library. Prior to 7.23, a network attacker can impersonate a TLS server to a Mongoose client configured with a multi-certificate CA bundle. In src/tls_builtin.c, the mg_tls_init() function stores the bundle in tls->ca_bundle_der while tls->ca_der.len remains zero, and mg_tls_recv_cert() uses tls_bundle_find() to accept a Common Name match without calling mg_tls_verify_cert_signature(). A forged self-signed certificate can therefore satisfy hostname and CertificateVerify checks and enable interception, credential disclosure, traffic modification, and malicious responses. This issue is fixed in version 7.23.","publishedAt":"2026-08-20T18:16:45","lastModifiedAt":"2026-08-20T20:17:46","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73251","cvssScore":9.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/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":0.00195,"riskScore":0.95,"affectedProduct":"mongoose","affectedVersions":"<7.23","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73251","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73251","en":"https://www.redsauce.net/en/cves/CVE-2026-73251","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73251","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73251","de":"https://www.redsauce.net/de/cves/CVE-2026-73251","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73251","el":"https://www.redsauce.net/el/cves/CVE-2026-73251"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73251"}}