{"schemaVersion":3,"id":"CVE-2026-5123","aliases":["UBUNTU-CVE-2026-5123","DEBIAN-CVE-2026-5123"],"status":"published","duplicateOf":null,"title":null,"description":"A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate this issue.","dates":{"published":"2026-03-30T15:15:14.229Z","modified":"2026-04-01T18:10:27.344Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.3,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":3.7,"severity":"low","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"CVE.org","score":2.6,"severity":"low","vector":"AV:N/AC:H/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":5.6,"impact":2.3,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":2.6,"severity":"low","vector":"AV:N/AC:H/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00677,"percentile":0.51649,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.268,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00409},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00677,"percentile":0.51649}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00409,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00677,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00677,"percentile":0.51649}]},"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-189","name":"Numeric Errors","description":"Weaknesses in this category are related to improper calculation or conversion of numbers.","type":"category","status":"Draft","abstraction":null,"likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/189.html"},{"id":"CWE-193","name":"Off-by-one Error","description":"A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/193.html"}],"affected":[{"vendor":"debian","product":"gobgp","name":"gobgp","label":"gobgp","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/gobgp","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 4.4.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 4.4.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"gobgp","name":"gobgp","label":"gobgp","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/gobgp","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"osrg","product":"gobgp","name":"gobgp","label":"gobgp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.0","noFixRecorded":false,"fixedIn":null},{"text":"4.1","noFixRecorded":false,"fixedIn":null},{"text":"4.2","noFixRecorded":false,"fixedIn":null},{"text":"4.3.0","noFixRecorded":false,"fixedIn":null},{"text":"< 4.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.0 | 4.1 | 4.2 | 4.3.0 | < 4.4.0","eol":null,"hubHref":"/vendor/osrg/gobgp"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://vuldb.com/vuln/354155","label":"vuldb.com/vuln/354155","hostname":"vuldb.com","tags":["VDB Entry","Technical Description","Third Party Advisory"]},{"url":"https://vuldb.com/vuln/354155/cti","label":"vuldb.com/vuln/354155/cti","hostname":"vuldb.com","tags":["Signature","Permissions Required","VDB Entry"]},{"url":"https://vuldb.com/submit/780179","label":"vuldb.com/submit/780179","hostname":"vuldb.com","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://github.com/osrg/gobgp/pull/3342","label":"github.com/osrg/gobgp/pull/3342","hostname":"github.com","tags":["Issue Tracking","Patch","REPORT"]},{"url":"https://github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800f","label":"github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800f","hostname":"github.com","tags":["Patch"]},{"url":"https://github.com/osrg/gobgp/","label":"github.com/osrg/gobgp/","hostname":"github.com","tags":["Product"]},{"url":"https://ubuntu.com/security/CVE-2026-5123","label":"ubuntu.com/security/CVE-2026-5123","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5123","label":"www.cve.org/CVERecord?id=CVE-2026-5123","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-5123","label":"security-tracker.debian.org/tracker/CVE-2026-5123","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-03-30T15:15:14.229Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-01T18:10:27.344Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":25,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T04:47:01.177Z","stale":false,"partial":false}}