mongoose: Mongoose is an embedded web server and network library
CVE-2026-73260 is fixed in mongoose on 1 platform by DEBIAN-CVE-2026-73260 (version 7.23+ds-1), released August 19, 2026. It is not reported as exploited. Patch Radar priority: High.
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg_der_to_tlv() and mg_der_next(), a peer-controlled length can advance the parser beyond the certificate and underflow the remaining uint32_t length, causing mg_tls_parse_cert_der() to continue walking an invalid pointer. An unauthenticated malicious TLS server, or a client presenting a certificate to a server configured for client certificates, can trigger an out-of-bounds read and denial of service during the handshake. This issue is fixed in version 7.23.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongoose · Debian 14 | 7.23+ds-1 | DEBIAN-CVE-2026-73260 | Aug 19, 2026 |
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