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Bouncy Castle Java EUVDEUVD-2026-52028

| CVE-2026-59646 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-03 bcorg GHSA-4m8h-6737-hrw6
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 pre-authentication DTLS endpoint requires no privileges or interaction; impact is availability-only heap exhaustion with no scope change.

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 - 01:33 vuln.today
Analysis Generated
Aug 03, 2026 - 01:33 vuln.today
CVE Published
Aug 03, 2026 - 00:48 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

AnalysisAI

Memory exhaustion denial-of-service in Bouncy Castle's DTLS implementation allows remote unauthenticated attackers to crash or degrade Java applications by sending crafted handshake messages with inflated 24-bit length fields. Affected are bc-java before 1.85, bc-lts-java before 2.73.12, and BC-FJA (bctls-fips) before 1.0.24, 2.0.24, or 2.1.24 depending on the deployed branch. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify DTLS UDP endpoint on target
Delivery
Send crafted handshake fragment with maximum 24-bit declared length
Exploit
Trigger unchecked 16MB heap allocation pre-authentication
Execution
Repeat at high rate across connections
Impact
Exhaust JVM heap and crash service
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Vulnerability AssessmentAI

Exploitation The target application must use Bouncy Castle's DTLS stack (bc-java, bc-lts-java, or bctls-fips) for network communication and must have a DTLS endpoint reachable by the attacker over UDP. … 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/VC:N/VI:N/VA:H) accurately reflects the threat model: any unauthenticated network attacker can trigger repeated large heap allocations with crafted UDP packets, and no special attack preconditions are required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with UDP reachability to a Java server's DTLS port sends a flood of crafted DTLS handshake records, each advertising a 24-bit message length near the maximum (~16MB), targeting the reassembler before any handshake authentication completes. Each malicious record causes the server to allocate a large heap buffer; repeated at sufficient rate, this exhausts the JVM heap and triggers an OutOfMemoryError, crashing the service or causing severe degradation. …
Remediation The primary fix is to upgrade to a patched release: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or bctls-fips 1.0.24 (for 1.0.X deployments), 2.0.24 (for 2.0.X), or 2.1.24 (for 2.1.X). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Java applications using bc-java (before 1.85), bc-lts-java (before 2.73.12), or BC-FJA (before 1.0.24/2.0.24/2.1.24) and assess which are exposed to network DTLS traffic. …

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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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EUVD-2026-52028 vulnerability details – vuln.today
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