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
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk14 | >= 1.81, < 1.81.1 | 1.81.1 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk15to18 | >= 1.71, < 1.80.2 | 1.80.2 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk18on | >= 1.82, < 1.84 | 1.84 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-5598
- https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5
- https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87
- https://github.com/bcgit/bc-java
- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598
- https://github.com/bcgit/bc-java/wiki/CVE-2026-5598
- CVSS vector
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- Weakness (CWE)
CWE-385- Platform
- Java / Kotlin (Maven)
- Package
org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15to18, org.bouncycastle:bcprov-jdk18on- Disclosed
- 17.04.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p93r-85wp-75v3 - CC BY 4.0
Vulnerability history: org.bouncycastle:bcprov-jdk14
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 26
- First → latest
- 10.2018 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 10
- Medium 14
- Low 1
Disclosures per year
- 2018: 12
- 2019: 1
- 2020: 0
- 2021: 3
- 2022: 0
- 2023: 2
- 2024: 4
- 2025: 1
- 2026: 3
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Bouncy Castle Has Covert Timing Channel Vulnerability this entry
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