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Bouncy Castle CVE-2026-59643

| EUVDEUVD-2026-52031 HIGH
Improper Verification of Cryptographic Signature (CWE-347)
2026-08-03 bcorg GHSA-r7xx-x336-xqqr
Java Information Disclosure Jwt Attack Bc Java Bc Fja
8.7
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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
vuln.today AI
7.5 HIGH

OpenPGP messages arrive over network without authentication; no user interaction on verifier side; impact is integrity-only as policy-violating signatures are silently accepted.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (bcorg).

CVSS VectorVendor: bcorg

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 01:35 vuln.today
Analysis Generated
Aug 03, 2026 - 01:35 vuln.today
CVE Published
Aug 03, 2026 - 00:51 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, OpenPGP inline-signature policy failures silently ignored. This issue also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 2.0.13.

AnalysisAI

OpenPGP inline-signature policy enforcement in Bouncy Castle for Java silently discards rejection exceptions, causing signatures that use prohibited weak hash algorithms (MD5, SHA-1, RIPEMD-160) or otherwise violate the configured OpenPGPPolicy to be reported as cryptographically valid. Affected are bc-java before 1.85 and bcpg-fips (bc-fja) before 2.0.13; the detached-signature and prefixed-signature verification paths are not affected - only the inline one-pass path. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain OpenPGP key trusted by target using weak hash (SHA-1/MD5)
Delivery
Create inline one-pass signed message
Exploit
Deliver message to application using vulnerable bc-java API
Install
Policy exception silently discarded in empty catch block
C2
Signature proceeds to cryptographic verify()
Execute
isTestedCorrect() returns true
Impact
Application trusts policy-violating signature as valid
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Vulnerability AssessmentAI

Exploitation The vulnerable code path is triggered exclusively by the inline one-pass OpenPGP signature verification flow, specifically OpenPGPMessageInputStream.OnePassSignatures.verify() in bc-java's high-level OpenPGP API. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N) scores 8.7, reflecting a straightforward unauthenticated network-reachable integrity failure with no confidentiality or availability component. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holds an OpenPGP key pair that is trusted by a target application but was generated using SHA-1 as the hash algorithm - historically the default in many PGP implementations. The attacker signs a malicious or unauthorized document using the inline (one-pass) signature format and submits it to the target application. …
Remediation Upgrade bc-java to version 1.85 or later and bcpg-fips to 2.0.13 or later; both fix versions are confirmed by the vendor release notes in the linked commit (https://github.com/bcgit/bc-java/commit/d3f8cc408b4a36d28e5a410c93436fe3d0fe726b) and the advisory at https://github.com/bcgit/bc-java/wiki/CVE-2026-59643. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all applications and services in production using bc-java or bcpg-fips and determine current versions. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-59643 vulnerability details – vuln.today
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