Improper Verification of Cryptographic Signature Affecting bouncycastle package, versions <0:1.70-4.amzn2023.0.8


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.16% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-BOUNCYCASTLE-19821119
  • published15 Sept 2026
  • disclosed3 Aug 2026

Introduced: 3 Aug 2026

CVE-2026-59639  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 bouncycastle to version 0:1.70-4.amzn2023.0.8 or higher.
This issue was patched in ALAS2023-2026-2153.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bouncycastle package and not the bouncycastle package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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).

CVSS Base Scores

version 3.1