{"schemaVersion":3,"id":"CVE-2026-81881","aliases":["UBUNTU-CVE-2026-81881"],"status":"published","duplicateOf":null,"title":null,"description":"radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0.","dates":{"published":"2026-09-22T15:05:21.940Z","modified":"2026-09-22T17:44:38.856Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.3,"severity":"low","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","exploitability":4.6,"impact":4.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.4,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00131,"percentile":0.02423,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-23T00:00:00.000Z","score":0.00168,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00168,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00125,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00131,"percentile":0.02423}],"last30":[{"date":"2026-09-23T00:00:00.000Z","score":0.00168,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00168,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00125,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00131,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00131,"percentile":0.02423}]},"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":[{"id":"GITHUB_RADAREORG_RADARE2","name":"Radare2","source":"github","url":"https://github.com/radareorg/radare2/issues/23953#issue-2844325926","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"},{"id":"CWE-191","name":"Integer Underflow (Wrap or Wraparound)","description":"The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/191.html"}],"affected":[{"vendor":"ubuntu","product":"radare2","name":"radare2","label":"radare2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/radare2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"radare","product":"radare2","name":"radare2","label":"radare2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 6.2.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 6.2.0","eol":null,"hubHref":"/vendor/radare/radare2"},{"vendor":"radareorg","product":"radare2","name":"radare2","label":"radare2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 6.2.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 6.2.0","eol":null,"hubHref":"/vendor/radareorg/radare2"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9","label":"github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","Patch","Vendor Advisory"]},{"url":"https://github.com/radareorg/radare2/issues/26229","label":"github.com/radareorg/radare2/issues/26229","hostname":"github.com","tags":["X Refsource MISC","REPORT","Exploit","Issue Tracking","Mitigation","Vendor Advisory"]},{"url":"https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74","label":"github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74","hostname":"github.com","tags":["X Refsource MISC","REPORT","Patch"]},{"url":"https://github.com/radareorg/radare2/releases/tag/6.2.0","label":"github.com/radareorg/radare2/releases/tag/6.2.0","hostname":"github.com","tags":["X Refsource MISC","REPORT","Release Notes"]},{"url":"https://ubuntu.com/security/CVE-2026-81881","label":"ubuntu.com/security/CVE-2026-81881","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81881","label":"www.cve.org/CVERecord?id=CVE-2026-81881","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21988-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21988-1"]},"timeline":[{"kind":"published","date":"2026-09-22T15:05:21.940Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-22T17:44:38.856Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T13:47:47.437Z","stale":false,"partial":false}}