CVE-2026-73261 | BDVDB-2026-388945 Detail

Description#

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-10-14Record published in the CVE List.
2. Version 22026-10-29Most recent update recorded in the CVE List.