CVE-2026-5588
Bouncy Castle Crypto Package For Java: Use of a Broken or Risky Cryptographic Algorithm vulnerability in bcpkix modules
Description
Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.
How to fix CVE-2026-5588
To remediate CVE-2026-5588, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
- —upgrade to 1.84 or later
Is CVE-2026-5588 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (8)
- from 0
- >= 1.49, < 1.84
- >= 1.49, < 1.84
- >= 1.49, < 1.84
- >= 1.49, < 1.84
- >= 1.49, < 1.84
- >= 1.49, < 1.84
- >= 1.49, < 1.84
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Green |