VDB
CVE-2026-5588
CVE-2026-5588
PUBLISHED
CVSS 6.300000190734863 MEDIUM
: Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules). PKIX draft CompositeVerifier accepts empty signature sequence as valid. This issue affects BC-JAVA: from 1.49 before 1.84.
EPSS 0.01% · 2.2th percentile
Risk Scores
CVSS 4.0
6.300000190734863
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
EPSS Score
0.01%
2.2th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cloudflare | images | |
| Legion of the Bouncy Castle Inc. | BC-JAVA | 1.67 |
| AWS | mq |
Exploit Intelligence
- CIRCL seen: CVE-2026-5588 (circl-sighting)
- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588 (circl)
- 9.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10-dev.yaml (github-poc)
- 10.yaml (github-poc)
…and 34 more exploits
Timeline
- Apr 15, 2026 CVE Published
- Apr 15, 2026 PoC Published
- Apr 16, 2026 EPSS Score
- Apr 16, 2026 Security Advisory
- May 6, 2026 Distribution Patch
- May 6, 2026 Security Advisory
- May 6, 2026 Distribution Patch
- May 6, 2026 Security Advisory
- May 6, 2026 Distribution Patch
- May 6, 2026 Security Advisory
- May 6, 2026 Distribution Patch
- May 6, 2026 Security Advisory