AIKIDO-2026-701225
cesanta.mongoose is vulnerable to Denial of Service (DoS)
65
Medium Risk
This Affects:
cesanta.mongooseTL;DR
find_opt in the built-in TCP/IP PPP option parser (src/l2_ppp.c) walks peer-supplied IPCP/IPV6CP options using each option's self-declared length byte, but never rejects a length below the 2-byte minimum. An option whose length byte is 0 advances the cursor by zero, so the loop never exits and the single-threaded event loop hangs. A network-adjacent PPP or PPPoE peer can permanently deny service with one crafted configuration packet. The fix rejects option lengths below 2 before advancing the parser.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and build Mongoose with the built-in TCP/IP stack (MG_ENABLE_TCPIP) using a PPP or PPPoE Layer-2 driver. Application-only users over host sockets are not affected.
Background info
cesanta.mongoose is vulnerable to Denial of Service (DoS) in versions 7.21 - 7.21.
How to fix this
Upgrade the mongoose library to the patch version.
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