What is CVE-2026-5598?

CVE-2026-5598 is a high-severity security vulnerability in org.bouncycastle:bcprov-jdk15to18 (maven), affecting versions >= 1.71, < 1.80.2. It is fixed in 1.80.2, 1.81.1, 1.84.

Which packages are affected by CVE-2026-5598?

org.bouncycastle:bcprov-jdk15to18 (maven) versions >= 1.71, = 1.81, = 1.82, < 1.84.

Is there a fix for CVE-2026-5598?

Yes. CVE-2026-5598 is fixed in 1.80.2, 1.81.1, 1.84. Upgrade to this version or later.

Is CVE-2026-5598 exploitable, and should I be worried?

Whether CVE-2026-5598 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2026-5598 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2026-5598 in org.bouncycastle:bcprov-jdk15to18

Q: Which packages are affected by CVE-2026-5598?

org.bouncycastle:bcprov-jdk15to18 (maven) versions >= 1.71, = 1.81, = 1.82, < 1.84.

Q: Is there a fix for CVE-2026-5598?

Yes. CVE-2026-5598 is fixed in 1.80.2, 1.81.1, 1.84. Upgrade to this version or later.

Q: Is CVE-2026-5598 exploitable, and should I be worried?

Whether CVE-2026-5598 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2026-5598 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2026-5598?

Upgrade: org.bouncycastle:bcprov-jdk15to18 to 1.80.2 or later, org.bouncycastle:bcprov-jdk14 to 1.81.1 or later, org.bouncycastle:bcprov-jdk18on to 1.84 or later.

Summary

Bouncy Castle Has Covert Timing Channel Vulnerability

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

Impact

Affected versions

org.bouncycastle:bcprov-jdk15to18 (>= 1.71, < 1.80.2) org.bouncycastle:bcprov-jdk14 (>= 1.81, < 1.81.1) org.bouncycastle:bcprov-jdk18on (>= 1.82, < 1.84)

Security releases

org.bouncycastle:bcprov-jdk15to18 → 1.80.2 (maven) org.bouncycastle:bcprov-jdk14 → 1.81.1 (maven) org.bouncycastle:bcprov-jdk18on → 1.84 (maven)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade the following packages to resolve this vulnerability:

org.bouncycastle:bcprov-jdk15to18 to 1.80.2 or later; org.bouncycastle:bcprov-jdk14 to 1.81.1 or later; org.bouncycastle:bcprov-jdk18on to 1.84 or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2026-5598? CVE-2026-5598 is a high-severity security vulnerability in org.bouncycastle:bcprov-jdk15to18 (maven), affecting versions >= 1.71, < 1.80.2. It is fixed in 1.80.2, 1.81.1, 1.84.
Which packages are affected by CVE-2026-5598?
- org.bouncycastle:bcprov-jdk15to18 (maven) (versions >= 1.71, < 1.80.2)
- org.bouncycastle:bcprov-jdk14 (maven) (versions >= 1.81, < 1.81.1)
- org.bouncycastle:bcprov-jdk18on (maven) (versions >= 1.82, < 1.84)
Is there a fix for CVE-2026-5598? Yes. CVE-2026-5598 is fixed in 1.80.2, 1.81.1, 1.84. Upgrade to this version or later.
Is CVE-2026-5598 exploitable, and should I be worried? Whether CVE-2026-5598 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2026-5598 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2026-5598?
- Upgrade org.bouncycastle:bcprov-jdk15to18 to 1.80.2 or later
- Upgrade org.bouncycastle:bcprov-jdk14 to 1.81.1 or later
- Upgrade org.bouncycastle:bcprov-jdk18on to 1.84 or later

Other vulnerabilities in org.bouncycastle:bcprov-jdk15to18

CVE-IDSeverityPackage summary

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