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Bouncy Castle Java CVE-2026-12185

| EUVDEUVD-2026-52021 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-08-03 bcorg GHSA-9mmj-j2r4-96mp
Java Information Disclosure Bc Java Bc Lts Java
7.1
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
6.5 MEDIUM

Network-reachable with no privileges; user/app interaction required to call KeyStore.load(); pure availability impact via OOM crash.

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
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: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
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 01:30 vuln.today
Analysis Generated
Aug 03, 2026 - 01:30 vuln.today
CVE Published
Aug 03, 2026 - 00:38 cve.org
HIGH 7.1

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, BKS/UBER keystore allocates from untrusted lengths before integrity check. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

AnalysisAI

Bouncy Castle for Java's BKS and UBER keystore implementation crashes with an OutOfMemoryError when loading a crafted keystore because heap allocation from stream-declared lengths occurs before the HMAC integrity check. Any application calling KeyStore.load() with attacker-controlled BKS or UBER keystore data is affected - bc-java before 1.85 and bc-lts-java before 2.73.12. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Supply crafted BKS/UBER keystore with Integer.MAX_VALUE length fields
Delivery
Application calls KeyStore.load() on attacker input
Exploit
BcKeyStoreSpi reads declared length before MAC check
Execution
JVM attempts unbounded heap allocation
Persist
OutOfMemoryError crashes JVM or service thread
Impact
Availability impact achieved
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Vulnerability AssessmentAI

Exploitation The application must call KeyStore.load() on attacker-controlled data in BKS or UBER format. … 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:P/VA:H) correctly captures the core risk profile: network-reachable, low complexity, no privileges required, but dependent on an application or user action that causes KeyStore.load() to be called with attacker-supplied data (UI:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can supply a crafted BKS or UBER keystore file - for example via a file upload endpoint, a configuration interface, or a management API that accepts keystore imports - provides a file of a few dozen bytes with one or more length fields set to Integer.MAX_VALUE. When the target application calls KeyStore.load() on this file, BcKeyStoreSpi immediately attempts to allocate a ~2 GB array before reaching the HMAC check, triggering an OutOfMemoryError that crashes the JVM process or the thread handling the request. …
Remediation Upgrade bc-java to version 1.85 or later, or bc-lts-java to version 2.73.12 or later, per the vendor advisory at https://github.com/bcgit/bc-java/wiki/CVE-2026-12185. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all applications and services using bc-java or bc-lts-java libraries and identify those that process untrusted or user-supplied keystore data. …

Sign in for detailed remediation steps and compensating controls.

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-2026-12185 vulnerability details – vuln.today
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