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Bouncy Castle Java CVE-2026-58063

| EUVDEUVD-2026-52088 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-03 bcorg GHSA-jmxg-924w-f7mv
Java Denial Of Service Bc Java Bc Lts Java Bc Fja Suse
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
6.5 MEDIUM

No privileges required; application must load the crafted keystore (UI:R); availability is High because unbounded scrypt can exhaust full JVM heap.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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 - 03:04 vuln.today
Analysis Generated
Aug 03, 2026 - 03:04 vuln.today
CVE Published
Aug 03, 2026 - 02:29 cve.org
MEDIUM 5.3

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

AnalysisAI

CPU and memory exhaustion in Bouncy Castle Java's BCFKS keystore loader exposes applications to pre-integrity-verification denial of service when processing a crafted keystore file. Any of the three affected library variants - bc-java (before 1.85), bc-lts-java (before 2.73.12), and BC-FJA (before 1.0.2.7, 2.0.2, or 2.1.3 depending on series) - will blindly honour attacker-supplied PBKDF2 iteration counts or scrypt cost parameters read from an untrusted file before the keystore MAC is verified, allowing an adversary to trigger arbitrary CPU or memory consumption at load time. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Craft BCFKS keystore with inflated PBKDF2/scrypt cost params
Delivery
Deliver malicious keystore to target application path or endpoint
Exploit
Application calls KeyStore.load() with untrusted file
Install
Library reads KDF params from unverified keystore
C2
Unbounded PBKDF2 or scrypt KDF executes pre-MAC-check
Execute
CPU or JVM heap exhausted
Impact
Application service denied
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application loads a BCFKS-format keystore file whose KDF parameters are attacker-controlled - either because the attacker can write or substitute the keystore file on disk, intercept and replace it during network retrieval, or inject it through any other path by which the application accepts a keystore from an external or untrusted source. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 score of 5.3 (Medium) reflects a network-reachable, low-complexity, unauthenticated vector that requires only passive user interaction (application loading the keystore) but limits measured impact to low availability in the vulnerable system with no confidentiality or integrity consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can supply or substitute a BCFKS keystore file - for example by poisoning a network-accessible keystore endpoint, manipulating a certificate automation pipeline, or delivering a malicious file via a phishing vector targeting an operator - crafts the file with a PBKDF2 iteration count near Integer.MAX_VALUE or scrypt parameters sized to fill available RAM. When the target Java application calls KeyStore.load() with the malicious file, the library begins computing the integrity-MAC key using the untrusted KDF parameters before any authenticity check runs, exhausting CPU or memory and rendering the application or service unresponsive. …
Remediation Upgrade to the earliest fixed release for your library variant: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, bc-fja 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series), or 2.1.3 (2.1.X series). … 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-2026-58063 vulnerability details – vuln.today
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