Skip to main content

Bouncy Castle Java EUVDEUVD-2026-52027

| CVE-2026-59647 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-08-03 bcorg GHSA-jjmc-c8fq-qcww
Java Denial Of Service Bc Java Bc Lts Java Bc Fja
6.9
CVSS 4.0 · Vendor: bcorg
Share

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-reachable, unauthenticated, zero-complexity attack drives billions of hash iterations per message, causing complete thread exhaustion and service unavailability - warrants A:H over the official VA:L.

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

2
Source Code Evidence Fetched
Aug 03, 2026 - 01:40 vuln.today
Analysis Generated
Aug 03, 2026 - 01:40 vuln.today

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, CRMF/CMP password-MAC honours unbounded iteration count. 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

CPU-exhaustion denial of service in Bouncy Castle for Java affects any server that verifies CMP (Certificate Management Protocol) password-MAC protected messages using PKMACBuilder without an explicit iteration ceiling. The library's PKMACBuilder accepted the iteration count directly from the unauthenticated PBMParameter field in an incoming CMP message with no upper bound, allowing a remote unauthenticated attacker to supply a count near 2^31 and force billions of hash iterations on the target. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send crafted CMP message to endpoint
Delivery
Embed near-2^31 iterationCount in unauthenticated PBMParameter
Exploit
Server passes count to PKMACBuilder.build()
Execution
Unbounded hash loop consumes CPU for billions of iterations
Persist
Thread blocked; repeat across connection pool
Impact
CMP service denial of service
Sign in to reveal

Vulnerability AssessmentAI

Exploitation The vulnerable code path is triggered only when a server verifies an incoming CMP message protected with a passwordBasedMac (ProtectedPKIMessage.verify(PBEMacCalculatorProvider, char[]) call path through PKMACBuilder). … 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) confirms remote, unauthenticated exploitation with low attack complexity and no prerequisites - an ideal profile for automated abuse. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker targeting a Java application that exposes a CMP endpoint - such as a private certificate authority, SCEP gateway, or EST server built on Bouncy Castle - crafts a CMP message with a passwordBasedMac ProtectionAlgorithm whose PBMParameter iterationCount is set to a value near 2,147,483,647 (2^31-1). When the server calls ProtectedPKIMessage.verify(PBEMacCalculatorProvider, char[]), the unpatched PKMACBuilder enters an iterated hash loop executing billions of iterations per message, consuming 100% of a CPU core for the duration. …
Remediation Upgrade to the patched release for your release train: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or the appropriate BC-FJA fix release (bcpkix-fips 1.0.12, 2.0.12, or 2.1.12 depending on your 1.0.X, 2.0.X, or 2.1.X series). … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Java

View all
CVE-2012-4681 CRITICAL POC
9.8 Aug 28

Oracle Java SE 7 Update 6 and earlier contains multiple sandbox bypass vulnerabilities via the ClassFinder and forName m
CVE-2015-7450 CRITICAL POC
9.8 Jan 02

Remote code execution in IBM Sterling B2B Integrator, Sterling Integrator, and Tivoli Common Reporting allows unauthenti
CVE-2013-2465 CRITICAL POC
9.8 Jun 18

Java Runtime Environment sandbox bypass via incorrect image channel verification in 2D component allows remote unauthent
CVE-2011-3544 CRITICAL POC
9.8 Oct 19

Oracle Java SE JDK/JRE 7 and 6 Update 27 and earlier allows remote code execution with complete system compromise throug
CVE-2010-1871 HIGH POC
8.8 Aug 05

JBoss Seam 2 in Red Hat JBoss EAP 4.3.0 fails to sanitize JBoss Expression Language inputs, allowing remote attackers to
CVE-2012-1723 CRITICAL POC
9.8 Jun 16

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 update 4 and earlier, 6 up
CVE-2013-0422 CRITICAL POC
9.8 Jan 10

Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using
CVE-2012-0507 CRITICAL POC
9.8 Jun 07

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 2 and earlier, 6 Up
CVE-2015-4852 CRITICAL POC
9.8 Nov 18

The WLS Security component in Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, and 12.2.1.0 allows remote attackers

CVE-2012-5076 CRITICAL POC
9.8 Oct 16

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 7 and earlier allow
CVE-2017-3066 CRITICAL POC
9.8 Apr 27

Remote unauthenticated attackers can execute arbitrary code on Adobe ColdFusion servers through Java deserialization fla
CVE-2012-0391 CRITICAL POC
9.8 Jan 08

The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during

Same weakness CWE-770 – Allocation of Resources Without Limits or Throttling

View all
CVE-2017-8779 HIGH POC
7.5
CVE-2025-53521 CRITICAL POC
9.3
CVE-2017-5850 HIGH POC
7.5
CVE-2025-26682 HIGH
7.5
CVE-2025-41770 HIGH
8.7
CVE-2025-26466 MEDIUM
5.9
CVE-2020-37067 CRITICAL POC
9.8
CVE-2021-47875 CRITICAL POC
9.8

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

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

Share

EUVD-2026-52027 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy