CVE-2026-5598 — Vulnerability in org.bouncycastle:bcprov-jdk14 —...

HIGH

Bouncy Castle Has Covert Timing Channel Vulnerability

Published April 17, 2026Updated September 10, 2026Source: osv

Summary

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java. This issue only affects users of the FrodoKEM algorithm involved in the decryption of encapsulations. This issue affects BC-JAVA: from 1.71 to 1.80.1, 1.81, 1.82 to 1.83. Fixed versions: 1.80.2, 1.81.1, 1.84

Advisory Timeline

First published April 17, 2026 (178 days ago).
Last revised September 10, 2026 — 145 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven

Update org.bouncycastle:bcprov-jdk14 to 1.81.1 or later

<!-- Update pom.xml dependency version to 1.81.1 for org.bouncycastle:bcprov-jdk14 -->

Maven

Update org.bouncycastle:bcprov-jdk15to18 to 1.80.2 or later

<!-- Update pom.xml dependency version to 1.80.2 for org.bouncycastle:bcprov-jdk15to18 -->

Maven

Update org.bouncycastle:bcprov-jdk18on to 1.84 or later

<!-- Update pom.xml dependency version to 1.84 for org.bouncycastle:bcprov-jdk18on -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: maven (3).

Package	Ecosystem	Affected	Fixed In
org.bouncycastle:bcprov-jdk14	maven	1.81	1.81.1
org.bouncycastle:bcprov-jdk15to18	maven	1.71, 1.72, 1.73, 1.74 (+7 more)	1.80.2
org.bouncycastle:bcprov-jdk18on	maven	1.82, 1.83	1.84

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-385
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Confidentiality

—

Integrity

—

Availability

—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:P/AU:Y/U:Red

References

Frequently Asked Questions

What is CVE-2026-5598?: Bouncy Castle Has Covert Timing Channel Vulnerability This vulnerability has been assigned a severity rating of HIGH (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2026-5598?: CVE-2026-5598 affects org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15to18 and org.bouncycastle:bcprov-jdk18on. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-5598 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-p93r-85wp-75v3

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