{"id":"CVE-2024-4027","aliases":[],"url":"https://o3.security/vulnerability/CVE-2024-4027","summary":"Undertow Servlets Vulnerable to Remote DoS via OutOfMemoryError when Passed Large Parameter Names","details":"A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.","published":"2026-01-30T15:31:14Z","modified":"2026-02-25T20:33:11.939526Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00348,"percentile":0.28193,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.2.39.Final"},{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.4.0.Beta1"},{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.3.21.Final"}],"fix":{"url":"https://github.com/undertow-io/undertow/pull/1860","label":"undertow-io/undertow#1860"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-4027"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/pull/1860"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/pull/1882"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/pull/1894"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/commit/6b7c18481ce65ae4012d92fe2b7f17a21ef4d70b"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/commit/8318dd36fdc2c9842baf10c5f1bfbb3bc23f75e7"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/commit/cb854c779b9e2368c3c274ebd7217c8e75d505be"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/commit/fb14baa51b611a4a9f755f1d8b07d6e12eac68e3"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2024-4027"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2276410"},{"type":"PACKAGE","url":"https://github.com/undertow-io/undertow"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/releases/tag/2.2.39.Final"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/releases/tag/2.3.21.Final"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/releases/tag/2.4.0.Beta1"},{"type":"WEB","url":"https://issues.redhat.com/browse/UNDERTOW-2377"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-02-25T20:33:11.939526Z"}}