Resource exhaustion in Harttle Liquidjs
CVE-2026-34166
LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.3, the replace filter in LiquidJS incorrectly accounts for memory usage when the memoryLimit option is enabled. It charges str.length + pattern.length + replacement.length bytes to the memory limiter, but the actual output from str.split(pattern).join(replacement) can be quadratically larger when the pattern occurs many times in the input string. This allows an attacker who controls template content to bypass the memoryLimit DoS protection with approximately 2,500x amplification, potentially causing out-of-memory conditions. This vulnerability is fixed in 10.25.3.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (44.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Harttle Liquidjs — versions < 10.25.3
- Liquidjs
Weakness classification (CWE)
References
- github.com/harttle/liquidjs/security/advisories/GHSA-mmg9-6m6j-jqqx (Exploit, Vendor Advisory)
- github.com/harttle/liquidjs/commit/abc058be0f33d6372cd2216f4945183167abeb25 (Patch)
- github.com/harttle/liquidjs/releases/tag/v10.25.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-34166?
- CVE-2026-34166 is a low-severity vulnerability in Harttle Liquidjs, classified under Uncontrolled Resource Consumption. CVSS score: 3.7/10. Published 2026-04-08.
- How severe is CVE-2026-34166?
- Low severity. CVSS v3 base score is 3.7 out of 10.