node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.
Weakness
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Ansible Automation Platform 2.5 | RedHat | ansible-automation-platform-25/lightspeed-rhel8:1789685837 | * |
| Red Hat Ansible Automation Platform 2.6 | RedHat | ansible-automation-platform-26/lightspeed-rhel9:1789656884 | * |
Related Attack Patterns
References
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
- https://github.com/digitalbazaar/forge
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js
- https://github.com/digitalbazaar/forge/issues/1149
- https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp