mongoose: Mongoose is an embedded web server and network library
CVE-2026-63626 is fixed in mongoose on 1 platform by DEBIAN-CVE-2026-63626 (version 7.23+ds-1), released August 19, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongoose · Debian 14 | 7.23+ds-1 | DEBIAN-CVE-2026-63626 | Aug 19, 2026 |
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