{"id":"CVE-2026-1528","aliases":["GHSA-f269-vfmq-vjvj"],"url":"https://o3.security/vulnerability/CVE-2026-1528","summary":"undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client","details":"### Impact\nA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. \n\n### Patches\n\n\n Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.\n\n### Workarounds\n\nThere are no workarounds.","published":"2026-03-12T20:21:57.775Z","modified":"2026-09-15T03:48:08.171596886Z","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":0.00488,"percentile":0.39813,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"undici","fixedVersion":"6.24.0"},{"ecosystem":"npm","name":"undici","fixedVersion":"7.24.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/nodejs/undici/"},{"type":"WEB","url":"https://hackerone.com/reports/3537648"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1528.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13826"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17789"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21931"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34342"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:5807"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7080"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7123"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7302"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7310"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7350"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7670"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7675"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7983"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:9742"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-1528"},{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1528.json"},{"type":"ADVISORY","url":"https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1528"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2447145"},{"type":"PACKAGE","url":"https://github.com/nodejs/undici"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T03:48:08.171596886Z"}}