Bouncycastle: In Bouncy Castle for Java before 1.85, OpenPGP inline-signature policy failures silently ignored. (CVE-2026-59643)
Description
Bouncy Castle for Java versions before 1.85 have a vulnerability where OpenPGP inline-signature policy failures are silently ignored. This affects both the standard and FIPS versions of Bouncy Castle for Java. The issue can lead to integrity violations without detection.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/bouncycastle?arch=source&distro=stonkingpkg:deb/ubuntu/bouncycastle?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-59643 affects Bouncy Castle for Java versions prior to 1.85 and Bouncy Castle for Java FIPS versions before bcpg-fips 2.0.13. The flaw causes OpenPGP inline-signature policy failures to be silently ignored, potentially allowing tampered or invalid signatures to go undetected. This undermines the integrity assurance normally provided by OpenPGP signatures.
Potential Impact
The silent ignoring of inline-signature policy failures means that attackers could manipulate signed data without detection, compromising data integrity. There is no impact on confidentiality or availability reported. The CVSS score of 7.5 (medium severity) reflects the high impact on integrity with network attack vector and no required privileges or user interaction.
Mitigation Recommendations
A fix is available in Bouncy Castle for Java version 1.85 and later, and in Bouncy Castle for Java FIPS version bcpg-fips 2.0.13 and later. Users should upgrade to these versions or later to remediate this vulnerability. No vendor advisory content was provided to indicate alternative mitigations or temporary fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-59643
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5da2cdf04f65666324d
Added to database: 10/17/2026, 22:25:30 UTC
Last enriched: 10/18/2026, 00:30:17 UTC
Last updated: 10/18/2026, 00:30:17 UTC
Views: 2
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