{"schema":"threatline.record/2","record":{"id":"CVE-2026-63626","aliases":["GHSA-pc66-j6r6-49x9"],"summary":"Mongoose: ppp_handle_ipv6cp() uses attacker-controlled length without bounds check — OOB read and heap overflow (PPP/PPPoE, MG_ENABLE_IPV6)","details":"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.","categories":["Unclassified"],"product":"mongoose","vendor":"cesanta","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-63626","source_modified_at":"2026-10-15T15:06:33.386Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"mongoose","vendor":"cesanta","versions":[{"version":"< 7.23","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00239,"percentile":0.14118,"score_date":"2026-10-23"},"published_at":"2026-10-14T18:26:16.830Z","modified_at":"2026-10-15T15:06:33.386Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-63626","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T15:06:33.386Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-63626","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/cesanta/mongoose/releases/tag/7.23","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-15T13:53:23.078452Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-15T15:06:33.386Z","content_hash":"6d0ed9eae4f64b98116fb34434bb083622f41dce021faa4c0ecc7ecb2ed27921"}}