{"id":"CVE-2026-63626","published":"2026-10-14T19:17:18.570","lastModified":"2026-10-16T20:04:29.760","description":"Mongoose is an embedded web server and network library. Prior to 7.23, ppp_handle_ipv6cp() in src/l2_ppp.c trusts the 16-bit IPv6CP len field without checking it against the received payload size. On a PPP or PPPoE link using MG_ENABLE_TCPIP and MG_ENABLE_IPV6, an unauthenticated adjacent peer can complete the required LCP exchange and send a short Configure-Request with an oversized length, causing ppp_tx_frame() to read beyond recv_queue.buf and write beyond tx.buf. The same length misuse can also expose adjacent heap bytes in a reply or hang the event loop through find_opt(). This issue is fixed in version 7.23.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-122","CWE-125"],"vendors":[],"products":[],"references":[{"url":"https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903","tags":[]},{"url":"https://github.com/cesanta/mongoose/releases/tag/7.23","tags":[]},{"url":"https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9","tags":[]}],"exploitRefs":[{"url":"https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903","tags":[]},{"url":"https://github.com/cesanta/mongoose/releases/tag/7.23","tags":[]},{"url":"https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9","tags":[]}],"hasPoc":true,"ai":null}