{"id":"CVE-2026-12644","aliases":["CLSA-2026-1792473266","CLSA-2026-1792490574","EUVD-2026-37991","GHSA-87mf-gv2c-c62c"],"status":"published","title":"ts-deepmerge: Prototype Method Override leads to DoS","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00507,"percentile":0.43535,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-248"],"published":"2026-06-19T05:00:00Z","modified":"2026-10-28T02:30:45Z","fixes":[{"ecosystem":"npm","package":"ts-deepmerge","fixed_in":["8.0.0"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"ts-deepmerge","fixed_in":["7.0.0-tuxcare.1","7.0.2-tuxcare.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"ts-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.0"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"ts-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0-tuxcare.0"},{"fixed":"7.0.0-tuxcare.1"}]}],"versions":["7.0.0"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"ts-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.2-tuxcare.0"},{"fixed":"7.0.2-tuxcare.1"}]}],"versions":["7.0.2"]},{"source":"osv","ecosystem":"npm","package":"ts-deepmerge","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0"}]}]}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141","tags":["web"]},{"url":"https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407","tags":["exploit","web"]},{"url":"https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c","tags":["fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12644","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-87mf-gv2c-c62c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12644.json","tags":["advisory"]},{"url":"https://github.com/voodoocreation/ts-deepmerge","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-12644","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T05:00:00.666Z","modified":"2026-06-22T15:03:43.502Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","level":"medium","assessor":"cna"}],"cwes":["CWE-248","CWE-248"],"updated_at":"2026-11-02T14:19:48.461833Z"}],"euvd":[{"id":"EUVD-2026-37991","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T05:00:00Z","modified":"2026-06-22T15:03:43Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T18:20:34.745289Z"}],"ghsa":[{"id":"GHSA-87mf-gv2c-c62c","title":"ts-deepmerge: Prototype Method Override leads to DoS","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T06:31:56Z","modified":"2026-06-19T21:41:53Z","cvss":[{"version":"4.0","score":5.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T14:40:31.656952Z"}],"nvd":[{"id":"CVE-2026-12644","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T06:17:01.64Z","modified":"2026-06-23T15:42:30.483Z","cvss":[{"version":"4.0","score":5.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T14:12:24.912854Z"}],"osv":[{"id":"CVE-2026-12644","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T05:00:00.666Z","modified":"2026-10-28T02:30:45.042203303Z","cvss":[{"version":"4.0","score":5.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T15:44:57.354194Z"},{"id":"GHSA-87mf-gv2c-c62c","title":"ts-deepmerge: Prototype Method Override leads to DoS","description":"Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.","status":"published","published":"2026-06-19T06:31:56Z","modified":"2026-06-19T21:56:30.084657Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"4.0","score":5.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T15:46:42.077781Z"},{"id":"CLSA-2026-1792473266","title":"TuxCare security update for ts-deepmerge (1 CVE)","description":"TuxCare rebuilt ts-deepmerge to address 1 CVE. Fixed in 7.0.0-tuxcare.1.","status":"published","published":"2026-10-20T05:14:26Z","modified":"2026-10-20T07:15:14.488102181Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792490574","title":"TuxCare security update for ts-deepmerge (1 CVE)","description":"TuxCare rebuilt ts-deepmerge to address 1 CVE. Fixed in 7.0.2-tuxcare.1.","status":"published","published":"2026-10-20T10:02:54Z","modified":"2026-10-20T13:45:13.460498266Z","updated_at":"2026-11-02T15:43:54.378946Z"}]}}