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Bouncy Castle Java EUVDEUVD-2026-52019

| CVE-2026-15055 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-03 bcorg GHSA-mx98-27g8-c9xc
Java Denial Of Service Bc Java Bc Lts Java Bc Fja
5.3
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
4.3 MEDIUM

Network-reachable but requires application to actively process attacker-supplied key material (UI:R); no confidentiality or integrity impact, only limited availability exhaustion.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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:P/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
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 01:29 vuln.today
Analysis Generated
Aug 03, 2026 - 01:29 vuln.today
CVE Published
Aug 03, 2026 - 00:32 cve.org
MEDIUM 5.3

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, PKCS#8 / PBES2 decryptors honour unbounded KDF cost from input. 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

Denial-of-service via unbounded KDF cost in Bouncy Castle for Java's PKCS#8 / PBES2 decryptors allows remote attackers to exhaust CPU or memory by supplying crafted encrypted key material with extreme KDF parameters. The vulnerability affects bc-java before 1.85, bc-lts-java before 2.73.12, and BC-FJA (bcpkix-fips) across all supported 1.0.X, 2.0.X, and 2.1.X series. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PKCS#8 key with extreme KDF cost
Delivery
Submit key via upload or API endpoint
Exploit
Application invokes BC PBES2 decryptor
Execution
Unbounded scrypt/PBKDF2 computation begins
Persist
CPU or JVM memory exhausted
Impact
Thread/process denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses a Bouncy Castle PKCS#8 or PBES2 decryptor (specifically `JceOpenSSLPKCS8DecryptorProviderBuilder` or `JcePKCSPBEInputDecryptorProviderBuilder`) to decrypt key material that originates from an attacker-controlled source. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 5.3 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L) reflects a moderate, network-reachable DoS with low availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted PKCS#8-encoded private key - for example, through a mutual-TLS client-certificate upload endpoint or a key-import API - in which the scrypt cost parameter N is set to an astronomically large value (e.g., 2^30) within the unauthenticated ASN.1 container. When the application calls a Bouncy Castle PBES2 decryptor to decrypt the key, it allocates and processes gigabytes of scrypt working memory before returning an error, causing the handling thread to stall and potentially crashing the JVM with an OutOfMemoryError. …
Remediation Upgrade to bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or the appropriate BC-FJA release (bcpkix-fips 1.0.12, 2.0.12, or 2.1.12 depending on the series in use). … 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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EUVD-2026-52019 vulnerability details – vuln.today
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