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Bouncy Castle Java CVE-2026-59648

| EUVDEUVD-2026-52026 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-03 bcorg GHSA-p3f8-5jpx-fgqm
Java Denial Of Service Bc Java Bc Lts Java Bc Fja
6.9
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 vector with no auth or interaction; A:H because attacker-controlled 1 TiB allocation crashes any typical JVM, contradicting the vendor's VA:L rating.

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:L/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 - 01:39 vuln.today
Analysis Generated
Aug 03, 2026 - 01:39 vuln.today
CVE Published
Aug 03, 2026 - 00:45 cve.org
MEDIUM 6.9

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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

Heap and CPU exhaustion in Bouncy Castle for Java's OpenPGP implementation allows remote unauthenticated attackers to cause denial of service by crafting OpenPGP messages with extreme Argon2 S2K cost parameters. The library honoured attacker-controlled memory, passes (iterations), and parallelism fields embedded in unauthenticated OpenPGP packets before any message authentication could occur, meaning a single crafted packet could instruct the JVM to allocate up to 2^30 KiB (approximately 1 TiB) of heap. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft OpenPGP SKESK packet with max Argon2 cost fields
Delivery
Deliver packet to network-exposed BC-based PGP service
Exploit
Library reads unauthenticated cost parameters unconditionally
Execution
JVM allocates up to 1 TiB heap and saturates CPU
Impact
Service crash or sustained denial of service
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Vulnerability AssessmentAI

Exploitation The target application must use Bouncy Castle for Java to process OpenPGP passphrase-based encrypted (symmetric) messages - specifically, it must invoke PBEDataDecryptorFactory or equivalent Bouncy Castle PGP decryption APIs against attacker-supplied ciphertext. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector provided (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L) scores 6.9, but the VA:L rating appears to understate the realistic worst-case impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a crafted OpenPGP SKESK packet to any network-reachable service that uses Bouncy Castle to decrypt passphrase-protected PGP messages - such as a mail gateway, secure document upload endpoint, or PGP-decrypting microservice. The packet encodes Argon2 S2K cost parameters set to their maximum values (memory exponent 30, passes 255, parallelism 255), which the unpatched library reads from the unauthenticated packet header and unconditionally honours, causing the JVM to attempt allocation of approximately 1 TiB of heap and consume all available CPU lanes, crashing or hanging the service. …
Remediation Upgrade to bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or bcpg-fips 1.0.13 (1.0.X), 2.0.13 (2.0.X), or 2.1.13 (2.1.X) as appropriate. … Detailed patch versions, workarounds, and compensating controls in full report.
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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-2026-59648 vulnerability details – vuln.today
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