{"id":"CVE-2020-37239","aliases":["EUVD-2020-31239","GHSA-4fvf-cvgm-9hvc","UBUNTU-CVE-2020-37239"],"status":"published","title":"libbabl 0.1.62 Broken Double Free Detection Memory Safety","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.","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":"2026-11-08","score":0.00459,"percentile":0.40041,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-415"],"published":"2026-05-16T15:25:55Z","modified":"2026-10-17T12:56:14Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.12-2","0.1.14-1","0.1.16-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.30-1","0.1.34-1","0.1.38-1","0.1.44-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.62-1","0.1.72-2","0.1.72-3","0.1.72-4","0.1.74-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.1.88-1","1:0.1.92-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.1.106-2","1:0.1.106-3","1:0.1.108-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.1.112-1","1:0.1.114-1","1:0.1.114-2","1:0.1.114-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.1.124-1","1:0.1.126-1","1:0.1.126-2","1:0.1.128-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"babl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.1.114-3","1:0.1.116-1","1:0.1.118-1","1:0.1.118-2","1:0.1.120-1","1:0.1.120-2","1:0.1.122-1","1:0.1.124-1"]}],"products":[{"vendor":"gegl","product":"libbabl"}],"references":[{"url":"https://www.exploit-db.com/exploits/49259","tags":["exploit","report"]},{"url":"https://www.gegl.org","tags":["product","report"]},{"url":"https://www.gegl.org/babl/","tags":["product","report"]},{"url":"https://www.vulncheck.com/advisories/libbabl-broken-double-free-detection-memory-safety","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-37239"},{"url":"https://www.gegl.org/babl"},{"url":"https://github.com/advisories/GHSA-4fvf-cvgm-9hvc"},{"url":"https://ubuntu.com/security/CVE-2020-37239","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-37239","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-37239","title":"libbabl 0.1.62 Broken Double Free Detection Memory Safety","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.","status":"published","published":"2026-05-16T15:25:55.585Z","modified":"2026-05-18T18:09:18.61Z","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-415"],"updated_at":"2026-11-02T14:35:47.22408Z"}],"euvd":[{"id":"EUVD-2020-31239","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.","status":"published","published":"2026-05-16T15:25:55Z","modified":"2026-05-18T18:09:18Z","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":"2026-11-02T18:21:16.184545Z"}],"ghsa":[{"id":"GHSA-4fvf-cvgm-9hvc","title":"libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to...","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.","status":"published","published":"2026-05-16T18:31:37Z","modified":"2026-05-16T18:31:44Z","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-415"],"updated_at":"2026-11-02T15:08:10.917908Z"}],"nvd":[{"id":"CVE-2020-37239","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.","status":"published","published":"2026-05-16T16:16:20.097Z","modified":"2026-09-29T10:10:00.263Z","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","assessor":"secondary"},{"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":"secondary"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:06:48.879919Z"}],"osv":[{"id":"UBUNTU-CVE-2020-37239","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.","status":"published","published":"2026-05-16T16:16:00Z","modified":"2026-10-17T12:56:14.303918621Z","cvss":[{"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"},{"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":"2026-11-02T15:54:25.179924Z"}]}}