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.
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History
Fri, 23 Oct 2026 00:45:00 +0000
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Cesanta mongoose |
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Cesanta
Cesanta mongoose |
Tue, 20 Oct 2026 02:30:00 +0000
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Wed, 14 Oct 2026 18:45:00 +0000
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| 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. | |
| Title | Mongoose: Out-of-bounds Read via length-counter underflow in built-in TLS X.509 DER parser | |
| Weaknesses | CWE-125 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-14T18:25:00.518Z
Updated: 2026-10-20T01:50:00.898Z
Reserved: 2026-08-11T17:18:01.598Z
Link: CVE-2026-73260
Updated: 2026-10-20T01:49:56.940Z
Status : Deferred
Published: 2026-10-14T19:17:19.840
Modified: 2026-10-20T02:17:11.720
Link: CVE-2026-73260
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