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Reject nonempty DigestAlgorithm NULL parameters - #1157
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Require DigestAlgorithm SEQUENCE element count (OID + optional NULL) so asn1.validate cannot ignore interior padding that bypasses CVE-2026-33894. Co-authored-by: Cursor <cursoragent@cursor.com>
Supplement the nested element-count fix with strict NULL contents validation and compatibility tests.
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Builds on #1152, with credit to @Krysthyan for its nested DigestAlgorithm element-count fix and @geo-chen for the original report.
This supplement also rejects primitive ASN.1 NULL parameters containing bytes, which must have empty contents. The new synthetic private-key fixtures demonstrate malformed-encoding acceptance, not forgery without a private key. Compatibility tests retain absent and empty NULL parameters, legacy BER verification, PSS, NONE, and native-generated signatures.
Tests: Node 24.14.1 with pinned upstream Mocha 5.2.0: 837 passing, 4 pending; RSA subset: 109 passing, 4 pending. Focused prior-code checks: 8 passing/1 expected failure; patched: 9 passing. Existing lint errors remain; the borrowed regression adds one unused-variable warning.
AI disclosure: Supplemental tests were generated by an AI agent using GPT-6 Astra (Max reasoning). The NULL guard already existed in our local Lerix mitigation. We are contributing it to support eventual adoption of an official release.