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CMS verifySignatures returns true for SignedData with zero signers

Legion of the Bouncy Castle Inc. BC-FJA · CVE-2026-59639
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What is it?

In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
8.7
EPSS
0.2%
First seen
7 d ago
Status
corroborated

All Legion of the Bouncy Castle Inc. vulnerabilities