{"schemaVersion":3,"id":"CVE-2026-8836","aliases":["UBUNTU-CVE-2026-8836","DEBIAN-CVE-2026-8836"],"status":"published","duplicateOf":null,"title":"lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow","description":"A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.","dates":{"published":"2026-05-18T18:45:12.791Z","modified":"2026-08-22T08:42:12.843Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":10,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"CVE.org","vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":9.3,"severity":"critical","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:P","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"CVE.org","score":10,"severity":"high","vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":9.3,"severity":"critical","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:P","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":9.3,"severity":"critical","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:P/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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.9,"severity":"high","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:P/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":10,"severity":"high","vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01557,"percentile":0.74989,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.45999999999999996,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.01097},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01557,"percentile":0.74989}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01097,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01557,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01557,"percentile":0.74989}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/119.html"},{"id":"CWE-121","name":"Stack-based Buffer Overflow","description":"A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/121.html"}],"affected":[{"vendor":"debian","product":"lwip","name":"lwip","label":"lwip","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/lwip","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.2.1+dfsg1-1+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.1+dfsg1-5","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.2.1+dfsg1-1+deb13u1 | < 2.2.1+dfsg1-5","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"lwip","name":"lwip","label":"lwip","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/lwip","purlType":"deb","versions":[{"text":"< 2.1.2+dfsg1-4ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.1.3+dfsg1-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.0+dfsg1-6.1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.2.1+dfsg1-4ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.1.2+dfsg1-4ubuntu0.1~esm1 | < 2.1.3+dfsg1-1ubuntu0.1~esm1 | < 2.2.0+dfsg1-6.1ubuntu0.1~esm1 | All versions (No fix recorded) | < 2.2.1+dfsg1-4ubuntu0.1~esm1","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://vuldb.com/vuln/364474","label":"vuldb.com/vuln/364474","hostname":"vuldb.com","tags":["VDB Entry","Technical Description","REPORT"]},{"url":"https://vuldb.com/vuln/364474/cti","label":"vuldb.com/vuln/364474/cti","hostname":"vuldb.com","tags":["Signature","Permissions Required","REPORT"]},{"url":"https://vuldb.com/cve/CVE-2026-8836","label":"vuldb.com/cve/CVE-2026-8836","hostname":"vuldb.com","tags":["Third Party Advisory"]},{"url":"https://vuldb.com/submit/829798","label":"vuldb.com/submit/829798","hostname":"vuldb.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://savannah.nongnu.org/bugs/?68055","label":"savannah.nongnu.org/bugs/?68055","hostname":"savannah.nongnu.org","tags":["Broken Link"]},{"url":"https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c","label":"cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c","hostname":"cgit.git.savannah.gnu.org","tags":["Broken Link","Patch","REPORT"]},{"url":"https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c","label":"github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c","hostname":"github.com","tags":["Patch","REPORT"]},{"url":"https://savannah.nongnu.org/bugs/?68194","label":"savannah.nongnu.org/bugs/?68194","hostname":"savannah.nongnu.org","tags":["Broken Link","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-8836","label":"ubuntu.com/security/CVE-2026-8836","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-8836","label":"www.cve.org/CVERecord?id=CVE-2026-8836","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8423-1","label":"ubuntu.com/security/notices/USN-8423-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-8836","label":"security-tracker.debian.org/tracker/CVE-2026-8836","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["USN-8423-1"]},"timeline":[{"kind":"published","date":"2026-05-18T18:45:12.791Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-22T08:42:12.843Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T20:04:30.198Z","stale":false,"partial":false}}