7.5
High
CVE-2026-73260 Mongoose is an embedded web server and network library
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Mongoose 7.23 | earliest → < 7.23 | 7.23 |
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The 38 CVEs of Mongoose →
CVE-2026-115473
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CVE-2026-63626
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8.8
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CVE-2026-73261
Mongoose is an embedded web server and network library
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CVE-2026-73252
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