{"id":"CVE-2026-15340","aliases":["DEBIAN-CVE-2026-15340","EUVD-2026-95820","GHSA-5x4f-h328-9vjh"],"status":"published","title":"Savannah lwIP SMTP client Classic Buffer Overflow","description":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00367,"percentile":0.30764,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2026-10-09T14:52:43Z","modified":"2026-10-12T09:47:43Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"lwip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.3+dfsg1-2","2.1.3+dfsg1-3","2.1.3+dfsg1-4","2.2.0+dfsg1-1","2.2.0+dfsg1-2","2.2.0+dfsg1-3","2.2.0+dfsg1-4","2.2.0+dfsg1-5","2.2.0+dfsg1-6","2.2.0+dfsg1-6.1","2.2.0+dfsg1-6.1~exp1","2.2.0+dfsg1-7","2.2.0+dfsg1-8","2.2.0+dfsg1-9","2.2.1+dfsg1-1","2.2.1+dfsg1-2","2.2.1+dfsg1-3","2.2.1+dfsg1-4","2.2.1+dfsg1-5","2.2.1+dfsg1-6","2.2.1+dfsg1-7","2.2.1+dfsg1-8"]},{"source":"osv","ecosystem":"Debian:13","package":"lwip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1+dfsg1-1","2.2.1+dfsg1-1+deb13u1","2.2.1+dfsg1-2","2.2.1+dfsg1-3","2.2.1+dfsg1-4","2.2.1+dfsg1-5","2.2.1+dfsg1-6","2.2.1+dfsg1-7","2.2.1+dfsg1-8"]},{"source":"osv","ecosystem":"Debian:14","package":"lwip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1+dfsg1-1","2.2.1+dfsg1-2","2.2.1+dfsg1-3","2.2.1+dfsg1-4","2.2.1+dfsg1-5","2.2.1+dfsg1-6","2.2.1+dfsg1-7","2.2.1+dfsg1-8"]}],"products":[{"vendor":"savannah","product":"lwip smtp client"}],"references":[{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-02"},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-279-02.json"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15340"},{"url":"https://github.com/advisories/GHSA-5x4f-h328-9vjh"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-15340","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-15340","title":"Savannah lwIP SMTP client Classic Buffer Overflow","description":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.","status":"published","published":"2026-10-09T14:52:43.517Z","modified":"2026-10-11T17:05:28.24Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T13:47:39.876248Z"}],"euvd":[{"id":"EUVD-2026-95820","description":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.","status":"published","published":"2026-10-09T14:52:43Z","modified":"2026-10-11T17:05:28Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T17:27:22.074542Z"}],"ghsa":[{"id":"GHSA-5x4f-h328-9vjh","title":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.","description":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.","status":"published","published":"2026-10-09T15:31:34Z","modified":"2026-10-09T15:31:35Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:13:00.589729Z"}],"nvd":[{"id":"CVE-2026-15340","description":"lwIP SMTP client does not check the size of inputs, potentially allowing a buffer 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overflow.","status":"published","published":"2026-10-09T15:17:13.51Z","modified":"2026-10-12T09:47:43.076923064Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"}],"updated_at":"2026-11-02T15:45:52.562592Z"}]}}