{"schemaVersion":3,"id":"CVE-2020-37239","aliases":["UBUNTU-CVE-2020-37239"],"status":"published","duplicateOf":null,"title":null,"description":"libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety checks by exploiting signature overwriting in freed chunks. Attackers can call babl_free() twice on the same pointer without triggering detection, as libc's malloc metadata overwrites babl's signature field upon freeing, enabling potential memory corruption and code execution.","dates":{"published":"2026-05-16T15:25:55.585Z","modified":"2026-05-18T18:09:18.610Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","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","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","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","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":"NVD","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: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":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}]},"epss":{"probability":0.00459,"percentile":0.38744,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00459},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00459,"percentile":0.38744}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00459,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00459,"percentile":0.38744}]},"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":"49259","name":"libbabl 0.1.62 - Broken Double Free Detection (PoC)","source":"exploit-database","url":"https://www.exploit-db.com/exploits/49259","maturity":"poc","reliabilityScore":0.5,"verified":false,"type":"local","platforms":["linux"],"requiresAuth":null,"exploitdb":{"verified":false,"type":"local","platform":"linux","file":"exploits/linux/local/49259.c","codes":[]},"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-415","name":"Double Free","description":"The product calls free() twice on the same memory address.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/415.html"}],"affected":[{"vendor":"ubuntu","product":"babl","name":"babl","label":"babl","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/babl","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"gegl","product":"libbabl","name":"libbabl","label":"libbabl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"0.1.62","noFixRecorded":false,"fixedIn":null}],"versionsText":"0.1.62","eol":null,"hubHref":"/vendor/gegl/libbabl"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.exploit-db.com/exploits/49259","label":"www.exploit-db.com/exploits/49259","hostname":"www.exploit-db.com","tags":["Exploit","REPORT"]},{"url":"https://www.gegl.org","label":"www.gegl.org","hostname":"www.gegl.org","tags":["Product","REPORT"]},{"url":"https://www.gegl.org/babl/","label":"www.gegl.org/babl/","hostname":"www.gegl.org","tags":["Product","REPORT"]},{"url":"https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety","label":"www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety","hostname":"www.vulncheck.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-37239","label":"ubuntu.com/security/CVE-2020-37239","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-37239","label":"www.cve.org/CVERecord?id=CVE-2020-37239","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-16T15:25:55.585Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-18T18:09:18.610Z","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":"2026-10-22T05:43:45.242Z","stale":false,"partial":false}}