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Bouncy Castle Java CVE-2026-59642

| EUVDEUVD-2026-52032 HIGH
Improper Validation of Integrity Check Value (CWE-354)
2026-08-03 bcorg GHSA-cfjh-c47f-gprf
Java Information Disclosure Bc Java Bc Lts 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

Attacker needs only to supply crafted AuthenticatedData with authAttrs; no authentication, no complexity; integrity fully bypassed, no confidentiality or availability impact.

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 - 00:53 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, CMS AuthenticatedData content not bound to MAC when authAttrs present. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

AnalysisAI

CMS AuthenticatedData integrity verification in Bouncy Castle for Java is bypassable when authenticated attributes (authAttrs) are present, allowing an attacker to substitute arbitrary content while the recipient MAC check passes without error. Affected are bc-java before 1.85, bc-lts-java before 2.73.12, and BC-FJA across the 1.0.x, 2.0.x, and 2.1.x series - all widely deployed in Java enterprise and FIPS environments. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain or intercept CMS AuthenticatedData message with authAttrs
Delivery
Replace eContent bytes with attacker-controlled data
Exploit
Leave authAttrs and MAC field untouched
Execution
Deliver modified message to target application
Persist
Application calls getMac() comparison - passes
Impact
Tampered content accepted as integrity-verified
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses the Bouncy Castle CMS AuthenticatedData API and processes messages that contain authenticated attributes (authAttrs). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VI:H) reflects a high-severity integrity bypass exploitable without authentication or preconditions, which aligns with the nature of the flaw: any application that processes externally supplied CMS AuthenticatedData messages with authAttrs is vulnerable without special configuration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker positioned to intercept or inject CMS AuthenticatedData messages - such as in a MITM scenario, a compromised message relay, or by acting as a malicious sender - replaces the eContent field with arbitrary bytes (e.g., a malicious payload or falsified business data) while leaving the authAttrs block and MAC value unchanged. When the recipient application calls recipient.getMac() and compares it to ad.getMac(), the comparison succeeds because the MAC over authAttrs is still valid; the application accepts the tampered content as cryptographically authenticated. …
Remediation Upgrade to bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or the appropriate BC-FJA series fix: bcpkix-fips 1.0.12 (1.0.x series), 2.0.12 (2.0.x series), or 2.1.12 (2.1.x series). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Java applications using Bouncy Castle (bc-java, bc-lts-java, BC-FJA) and prioritize systems handling authenticated or signed data. …

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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-2026-59642 vulnerability details – vuln.today
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