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Bouncy Castle Java CVE-2026-59649

| EUVDEUVD-2026-52025 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-03 bcorg GHSA-r7h8-35pv-fwgx
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-auth parse path, no privileges or interaction required; impact is heap exhaustion (availability only) with no confidentiality or integrity effect.

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 - 01:32 vuln.today
Analysis Generated
Aug 03, 2026 - 01:32 vuln.today
CVE Published
Aug 03, 2026 - 00:44 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, OpenPGP user-attribute subpacket length bounded only by JVM max memory. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

AnalysisAI

Memory exhaustion in Bouncy Castle for Java's OpenPGP parser enables unauthenticated remote denial of service via a crafted User Attribute subpacket with an oversized length header. All Java applications importing untrusted OpenPGP certificates using bc-java before 1.85, bc-lts-java before 2.73.12, or BC-FJA (FIPS) in affected series are vulnerable to pre-authentication JVM heap exhaustion. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send crafted OpenPGP certificate to parsing endpoint
Delivery
Supply User Attribute subpacket with ~2 GiB declared body length
Exploit
UserAttributeSubpacketInputStream reads length and calls new byte[bodyLen - 1]
Execution
JVM heap exhaustion before any body bytes are read
Persist
OutOfMemoryError or process crash
Impact
Service denial of service
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Vulnerability AssessmentAI

Exploitation The vulnerability fires during OpenPGP certificate parsing in `UserAttributeSubpacketInputStream`-it is pre-authentication by nature, requiring no credentials or session. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) confirms a remotely exploitable, unauthenticated, low-complexity denial-of-service with high availability impact and no attack requirements. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker constructs a malicious OpenPGP certificate containing a User Attribute subpacket with a 4-octet length header declaring approximately 2 GiB of body data, then submits it to any service endpoint-such as a PGP key import API, key server query handler, or signed-message verification service-backed by a vulnerable Bouncy Castle version. The JVM allocates a multi-gigabyte byte array before reading any body content, triggering an OutOfMemoryError or JVM process termination. …
Remediation Upgrade to Bouncy Castle for Java 1.85 or later, Bouncy Castle for Java LTS 2.73.12 or later, or the corrected BC-FJA (bcpg-fips) release appropriate to your series: 1.0.13 (1.0.X), 2.0.13 (2.0.X), or 2.1.13 (2.1.X). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct an inventory of all Java applications and dependencies using Bouncy Castle (bc-java, bc-lts-java, BC-FJA) and identify which systems accept OpenPGP certificates from untrusted sources. …

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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-2026-59649 vulnerability details – vuln.today
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