CVE-2026-73261

Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TCP/IP stack enabled by MGENABLETCPIP in src/netbuiltin.c does not reject a TCP option whose declared opts1 length exceeds the remaining option bytes. In handleopt, a NOP followed by a truncated MSS option causes...

CVE-2026-73261 Mongoose: handle_opt() missing opts[1] > len check — 1-byte OOB read corrupts TCP MSS, silences mg_send() per connection

Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TCP/IP stack enabled by MGENABLETCPIP in src/netbuiltin.c does not reject a TCP option whose declared opts1 length exceeds the remaining option bytes. In handleopt, a NOP followed by a truncated MSS option causes...

CVE-2026-6985

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handleopt of the file /src/netbuiltin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The...

CVE-2026-6985: Loop with Unreachable Exit Condition

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handleopt of the file /src/netbuiltin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The...