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Bouncy Castle Java CVE-2026-59645

| EUVDEUVD-2026-52029 HIGH
Uncontrolled Recursion (CWE-674)
2026-08-03 bcorg GHSA-mvf5-ghmw-pmr7
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:N/VA:H/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

Network-reachable with no authentication or privileges required; sole impact is availability (DoS via stack exhaustion); no confidentiality or integrity effect; scope unchanged as crash is confined to the parsing JVM.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:N/VA:H/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 - 01:34 vuln.today
Analysis Generated
Aug 03, 2026 - 01:34 vuln.today
CVE Published
Aug 03, 2026 - 00:49 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, OER parser recurses without depth limit on self-referential IEEE 1609.2 schema. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcutil-fips 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

AnalysisAI

Unbounded recursion in Bouncy Castle's OER (Octet Encoding Rules) parser enables remote unauthenticated denial-of-service against any Java application processing IEEE 1609.2 V2X messages. Because the IEEE 1609.2 schema is cyclic - an Ieee1609Dot2Data structure can nest inside its own SignedData payload - a few kilobytes of crafted input drive the parser into unbounded recursive descent, terminating in a JVM StackOverflowError. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft self-referential IEEE 1609.2 OER payload
Delivery
Deliver to network-exposed parsing endpoint
Exploit
OERInputStream accepts input pre-signature-verification
Execution
Cyclic schema drives unbounded recursive descent
Persist
JVM StackOverflowError terminates parsing thread
Impact
Service availability disrupted
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses Bouncy Castle's OERInputStream to parse IEEE 1609.2 or ETSI TS 103 097 V2X message structures from attacker-controlled input, and that this parsing occurs before signature verification - which is the standard operational flow in the affected library. … 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/VA:H) accurately characterises the threat: network-reachable, unauthenticated, low complexity, high availability impact, no confidentiality or integrity effect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated remote attacker sends a few kilobytes of crafted IEEE 1609.2 OER-encoded data - with a self-referential Ieee1609Dot2Data structure nested inside its own SignedData payload - to any network-exposed endpoint that passes untrusted input to Bouncy Castle's OERInputStream before signature verification. The parser enters unbounded recursive descent across the cyclic schema, exhausting the JVM thread stack and throwing StackOverflowError, which crashes the parsing thread or the entire JVM process. …
Remediation Upgrade to Bouncy Castle for Java 1.85 or later, Bouncy Castle LTS 2.73.12 or later, or bcutil-fips 2.0.7 (2.0.x series) or 2.1.7 (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 and services using Bouncy Castle in your environment, particularly those processing IEEE 1609.2 V2X messages; document current versions, patch levels, and deployment locations. …

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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-2026-59645 vulnerability details – vuln.today
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