{"id":"CVE-2021-43308","aliases":["EUVD-2022-6096","GHSA-mmh6-m7v9-5956"],"status":"published","title":"Exponential ReDoS in markdown-link-extractor","description":"An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported function","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01097,"percentile":0.65903,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2022-06-01T16:47:49Z","modified":"2026-10-24T10:30:16Z","fixes":[{"ecosystem":"npm","package":"markdown-link-extractor","fixed_in":["3.0.2","4.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"markdown-link-extractor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"markdown-link-extractor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.1"}]}]},{"source":"osv","ecosystem":"npm","package":"markdown-link-extractor","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.2"}]}]},{"source":"osv","ecosystem":"npm","package":"markdown-link-extractor","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.1"}]}]}],"products":[{"vendor":"markdown-link-extractor","product":"markdown-link-extractor"},{"vendor":"markdown-link-extractor_project","product":"markdown-link-extractor"}],"references":[{"url":"https://research.jfrog.com/vulnerabilities/markdown-link-extractor-redos-xray-211350/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43308","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mmh6-m7v9-5956"},{"url":"https://github.com/tcort/markdown-link-extractor","tags":["package"]},{"url":"https://research.jfrog.com/vulnerabilities/markdown-link-extractor-redos-xray-211350","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-43308","title":"Exponential ReDoS in markdown-link-extractor","description":"An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported 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triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported function","status":"published","published":"2022-06-03T00:01:00Z","modified":"2023-01-27T05:07:35Z","cwes":["CWE-1333"],"updated_at":"2026-11-02T14:36:22.592333Z"}],"nvd":[{"id":"CVE-2021-43308","description":"An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported function","status":"published","published":"2022-06-02T14:15:31.047Z","modified":"2026-06-17T04:10:49.703Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","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"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:07:06.501652Z"}],"osv":[{"id":"CVE-2021-43308","description":"An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the markdown-link-extractor npm package, when an attacker is able to supply arbitrary input to the module's exported 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