CVE-2026-73261
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TCP/IP stack enabled by MG_ENABLE_TCPIP in src/net_built
CVSS
7.5
Alta
EPSS
0.4%
p36
KEV
—
Exploit Today
11
0-100
Publicado: 14 de out. de 2026 · Última mod.: 29 de out. de 2026 · CWE-20 · CWE-125
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TCP/IP stack enabled by MG_ENABLE_TCPIP in src/net_builtin.c does not reject a TCP option whose declared opts[1] length exceeds the remaining option bytes. In handle_opt(), a NOP followed by a truncated MSS option causes opts[3] to be read outside the declared options area and used as the low byte of dmss. An unauthenticated remote peer can corrupt the per-connection MSS value so later mg_send() calls transmit truncated or zero-length application payloads while the TCP connection otherwise appears healthy. This issue is fixed in version 7.23.
- github.comhttps://github.com/cesanta/mongoose/commit/cc7c6d2d18c28fcc6d085633dddd88402946140a
- github.comhttps://github.com/cesanta/mongoose/releases/tag/7.23
- github.comhttps://github.com/cesanta/mongoose/security/advisories/GHSA-3fmr-92g4-wchx
- github.comhttps://github.com/cesanta/mongoose/security/advisories/GHSA-3fmr-92g4-wchx