CVE-2026-5588

Aliases:GHSA-wg6q-6289-32hp
Advisory lineage Upstream: 0 Downstream: 5
Awaiting Analysis
Published: 15 Apr 2026, 09:06
Last modified:16 Jul 2026, 12:04

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
0.39% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Apr 2026, 09:06
Published
Vulnerability first disclosed
16 Jul 2026, 12:04
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v4.0•MEDIUM•Score: 6.3CVSS: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:Amber
  • v4.0•MEDIUM•Score: 6.3CVSS: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:Amber
  • v4.0•MEDIUM•Score: 6.3CVSS: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
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Trends

Current EPSS score: 0.39%• Percentile: 31%

Techniques & Countermeasures

  • CWE-327•Use of a Broken or Risky Cryptographic Algorithm

    The product uses a broken or risky cryptographic algorithm or protocol.

  • CWE-347•Improper Verification of Cryptographic Signature

    The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Affected Systems

  • legion of the bouncy castle inc.•bc-java

    ≥ 1.49, < 1.84 | ≥ 1.67, < 1.84 | ≥ 1.67, < 1.80.2 | ≥ 1.81, < 1.81.1 | ≥ 1.82, < 1.84

  • legion of the bouncy castle inc.•bcpix-lts

    ≥ 2.73.7, < 2.73.11

  • legion of the bouncy castle inc.•bcpkix-fips

    ≥ 2.0.6, < 2.0.11 | ≥ 2.1.7, < 2.1.11

  • org.bouncycastle•bcpkix-debug-jdk14

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-debug-jdk15to18

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-debug-jdk18on

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-jdk14

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-jdk15on

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-jdk15to18

    ≥ 1.49, < 1.84

  • org.bouncycastle•bcpkix-jdk18on

    ≥ 1.49, < 1.84

References (17)