VulnerabilityAnalyzed
CVE-2026-59639
In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers.
HIGH 8.7EPSS 0.16%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- bouncycastle/bc-java · bouncycastle/bcpkix-fips · bouncycastle/bouncy castle for java lts
- Source
- 91579145-5d7b-4cc5-b925-a0262ff19630
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.