CVE-2026-118781
Forge: Denial of Service via infinite loop in BigInteger.modInverse() with negative input (incomplete fix of CVE-2026-33891)
Impact
Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.1, the affected implementation used BigInteger.prototype.modInverse(), bnModInverse(), lib/jsbn.js, RSA public exponent e to process the relevant input or security decision. node-forge's bundled jsbn implementation entered an infinite loop when BigInteger.prototype.modInverse() received a negative value or modulus. An attacker who could control the RSA public exponent passed to key generation, or a direct modInverse() operand, could block the Node.js event loop at full CPU. Parsed DER, PEM, JWK, PKCS#12, X.509, and TLS values are unsigned and cannot trigger this issue. This issue is fixed in version 1.4.1.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | node-forge | <= 1.4.0 | 1.4.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Digitalbazaar | Forge | before 1.4.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h6cr-wjv9-3cpp
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-h6cr-wjv9-3cpp
- https://nvd.nist.gov/vuln/detail/CVE-2026-118781
- https://github.com/digitalbazaar/forge/commit/e96c47b7f006dec66fb7bb1934e7375498b04a72
- https://github.com/digitalbazaar/forge/releases/tag/v1.4.1