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In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. 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minimalist web framework for node. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 are affected by an open redirect vulnerability using malformed URLs. When a user of Express performs a redirect using a user-provided URL Express performs an encode [using `encodeurl`](https://github.com/pillarjs/encodeurl) on the contents before passing it to the `location` header. This can cause malformed URLs to be evaluated in unexpected ways by common redirect allow list implementations in Express applications, leading to an Open Redirect via bypass of a properly implemented allow list. The main method impacted is `res.location()` but this is also called from within `res.redirect()`. The vulnerability is fixed in 4.19.2 and 5.0.0-beta.3.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-29041.json","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-29041.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-29041","reference_id":"","reference_type":"","scores":[{"value":"0.00154","scoring_system":"epss","scoring_elements":"0.36117","published_at":"2026-06-12T12:55:00Z"},{"value":"0.00154","scoring_system":"epss","scoring_elements":"0.35937","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-29041"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-29041","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-29041"},{"reference_url":"https://github.com/expressjs/express","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/expressjs/express"},{"reference_url":"https://github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd","reference_id":"0867302ddbde0e9463d0564fea5861feb708c2dd","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-03-26T13:59:28Z/"}],"url":"https://github.com/expressjs/express/commit/0867302ddbde0e9463d0564fea5861feb708c2dd"},{"reference_url":"https://github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94","reference_id":"0b746953c4bd8e377123527db11f9cd866e39f94","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-03-26T13:59:28Z/"}],"url":"https://github.com/expressjs/express/commit/0b746953c4bd8e377123527db11f9cd866e39f94"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068346","reference_id":"1068346","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068346"},{"reference_url":"https://github.com/koajs/koa/issues/1800","reference_id":"1800","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-03-26T13:59:28Z/"}],"url":"https://github.com/koajs/koa/issues/1800"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2290901","reference_id":"2290901","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2290901"},{"reference_url":"https://github.com/expressjs/express/pull/5539","reference_id":"5539","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-03-26T13:59:28Z/"}],"url":"https://github.com/expressjs/express/pull/5539"},{"reference_url":"https://expressjs.com/en/4x/api.html#res.location","reference_id":"api.html#res.location","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-03-26T13:59:28Z/"}],"url":"https://expressjs.com/en/4x/api.html#res.location"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2024-29041","reference_id":"CVE-2024-29041","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-29041"},{"reference_url":"https://github.com/advisories/GHSA-rv95-896h-c2vc","reference_id":"GHSA-rv95-896h-c2vc","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-rv95-896h-c2vc"},{"ref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This issue is patched in express 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