{"id":"CVE-2020-26302","aliases":["EUVD-2023-2119","GHSA-pvrw-g6fx-mcx2"],"status":"published","title":"is_js vulnerable to Regular Expression Denial of Service","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00924,"percentile":0.60736,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1333","CWE-400"],"published":"2022-12-22T21:15:08.877Z","modified":"2026-10-20T10:52:57Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"is_js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.9.0"}]}]},{"source":"osv","ecosystem":"npm","package":"is_js","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.9.0"}]}]}],"products":[{"vendor":"arasatasaygin","product":"is.js"},{"vendor":"is.js_project","product":"is.js"}],"references":[{"url":"https://securitylab.github.com/advisories/GHSL-2020-295-redos-is.js","tags":["x_transferred","Exploit","Third Party Advisory","evidence","advisory"]},{"url":"https://github.com/arasatasaygin/is.js/issues/320","tags":["x_transferred","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26302","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pvrw-g6fx-mcx2"},{"url":"https://github.com/arasatasaygin/is.js","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2020-26302","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2022-12-23T23:03:51.372Z","modified":"2025-04-14T14:37:16.925Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2023-2119","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2022-12-23T23:03:51Z","modified":"2025-04-14T14:37:16Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T20:52:33.975888Z"}],"ghsa":[{"id":"GHSA-pvrw-g6fx-mcx2","title":"is_js vulnerable to Regular Expression Denial of Service","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop \"forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2023-07-06T19:24:05Z","modified":"2023-07-06T21:46:36Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:36:55.91458Z"}],"nvd":[{"id":"CVE-2020-26302","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2022-12-22T21:15:08.877Z","modified":"2026-06-17T03:08:02.12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:06:47.286386Z"}],"osv":[{"id":"CVE-2020-26302","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2022-12-22T21:15:08.877Z","modified":"2026-10-20T10:52:57.97967989Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-pvrw-g6fx-mcx2","title":"is_js vulnerable to Regular Expression Denial of Service","description":"is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop \"forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.","status":"published","published":"2023-07-06T19:24:05Z","modified":"2023-11-08T04:03:18.759304Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-02T15:46:53.700556Z"}]}}