{"id":"CVE-2021-32723","aliases":["GHSA-gj77-59wh-66hg"],"url":"https://o3.security/vulnerability/CVE-2021-32723","summary":"Regular Expression Denial of Service (ReDoS) in Prism","details":"Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS).\n\n### Impact\n\nWhen Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. Do not use the following languages to highlight untrusted text.\n\n- ASCIIDoc\n- ERB\n\nOther languages are __not__ affected and can be used to highlight untrusted text.\n\n### Patches\nThis problem has been fixed in Prism v1.24.\n\n### References\n\n- PrismJS/prism#2774\n- PrismJS/prism#2688\n","published":"2021-06-28T20:15:07.857Z","modified":"2026-10-20T10:54:42.823202511Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"prismjs","fixedVersion":"1.24.0"}],"fix":{"url":"https://github.com/PrismJS/prism/pull/2688","label":"PrismJS/prism#2688"},"references":[{"type":"ADVISORY","url":"https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg"},{"type":"FIX","url":"https://github.com/PrismJS/prism/pull/2688"},{"type":"FIX","url":"https://github.com/PrismJS/prism/pull/2774"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32723"},{"type":"WEB","url":"https://github.com/PrismJS/prism/commit/d85e30da6755fdbe7f8559f8e75d122297167018"},{"type":"PACKAGE","url":"https://github.com/PrismJS/prism"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:54:42.823202511Z"}}