EUVD-2026-22871

| CVE-2026-5588 MEDIUM
2026-04-15 bcorg GHSA-wg6q-6289-32hp
Java Information Disclosure
6.3
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Green
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
patch_available
Apr 16, 2026 - 05:29 EUVD
1.84
Severity Changed
Apr 15, 2026 - 17:22 NVD
CRITICAL MEDIUM
CVSS Changed
Apr 15, 2026 - 17:22 NVD
10.0 (CRITICAL) 6.3 (MEDIUM)
Analysis Generated
Apr 15, 2026 - 12:38 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 436 maven packages depend on org.bouncycastle:bcpkix-jdk15on (84 direct, 353 indirect)

Ecosystem-wide dependent count for version 1.49.

DescriptionNVD

: 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.

AnalysisAI

Signature verification bypass in Bouncy Castle BC-JAVA (bcpkix module versions 1.49-1.83) allows remote unauthenticated attackers to forge cryptographic signatures by submitting empty signature sequences that are incorrectly accepted as valid by the draft CompositeVerifier implementation. This critical flaw (CVSS 4.0: 10.0) enables complete subversion of digital signature trust chains, potentially allowing authentication bypass, code signing forgery, and man-in-the-middle attacks against Java ap

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RemediationAI

Within 24 hours: Identify all Java applications and systems using Bouncy Castle bcpkix module versions 1.49-1.83 (check Maven dependencies, build artifacts, and runtime classpath). Within 7 days: Contact Bouncy Castle maintainers to confirm patch availability timeline; establish a temporary signature validation bypass detection process and implement enhanced monitoring for suspicious certificate validation patterns. …

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EUVD-2026-22871 vulnerability details – vuln.today
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