Vulnerability Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for low public exponent keys (e=3). Attackers can forge signatures by stuffing “garbage” bytes within the ASN structure in order to construct a signature that passes verification, enabling Bleichenbacher style forgery. This issue is similar to CVE-2022-24771, but adds bytes in an addition field within the ASN structure, rather than outside of it. Additionally, forge does not validate that signatures include a minimum of 8 bytes of padding as defined by the specification, providing attackers additional space to construct Bleichenbacher forgeries. Version 1.4.0 patches the issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Digitalbazaar | Forge | < 1.4.0 |
Related Weaknesses (CWE)
References
- https://datatracker.ietf.org/doc/html/rfc2313#section-8Third Party Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QEThird Party Advisory
- https://www.rfc-editor.org/rfc/rfc8017.htmlThird Party Advisory
FAQ
What is CVE-2026-33894?
CVE-2026-33894 is a vulnerability with a CVSS score of 7.5 (HIGH). Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for l...
How severe is CVE-2026-33894?
CVE-2026-33894 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33894?
Check the references section above for vendor advisories and patch information. Affected products include: Digitalbazaar Forge.