{"id":"CVE-2026-45617","aliases":["GHSA-r7g9-xpmj-5fcq"],"url":"https://o3.security/vulnerability/CVE-2026-45617","summary":"LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` Filter Regex","details":"LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, the built-in strip_html filter uses a regex containing four flawed lazy-quantified alternatives, leading to ReDoS via quadratic backtracking. When the input contains many <script, <style, or <!-- opener tokens without matching closers, the V8 regex engine performs O(N²) backtracking, blocking the Node.js event loop. A single ~350 KB request ('<script'.repeat(50000)) stalls the process for ~10 seconds; cost grows quadratically with input size. The default memoryLimit: Infinity does not bound regex CPU, and even when configured strip_html only charges str.length to the limit — the regex itself runs unbounded.  A single unauthenticated request containing crafted untrusted input can cause severe event-loop blocking and CPU amplification that saturates Node.js workers while bypassing memoryLimit protections. This issue has been fixed in version 10.26.0.","published":"2026-06-17T22:14:38.396Z","modified":"2026-08-07T11:51:12.845383336Z","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":0.00385,"percentile":0.31337,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"liquidjs","fixedVersion":"10.26.0"}],"fix":{"url":"https://github.com/harttle/liquidjs/commit/3616a744b9abeb425c217b340a2397d46176afb8","label":"harttle/liquidjs@3616a74"},"references":[{"type":"WEB","url":"https://github.com/harttle/liquidjs/releases/tag/v10.26.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45617.json"},{"type":"ADVISORY","url":"https://github.com/harttle/liquidjs/security/advisories/GHSA-r7g9-xpmj-5fcq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45617"},{"type":"FIX","url":"https://github.com/harttle/liquidjs/commit/3616a744b9abeb425c217b340a2397d46176afb8"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:12.845383336Z"}}