Skip to main content

Bouncy Castle Java CVE-2026-13506

| EUVDEUVD-2026-52139 HIGH
Uncontrolled Recursion (CWE-674)
2026-08-03 bcorg GHSA-qp49-qgx5-5m26
Java Information Disclosure Bc Java Bc Lts Java Bc Fja Suse
8.7
CVSS 4.0 · Vendor: bcorg
Share

Severity by source

Vendor (bcorg) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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
7.5 HIGH

Network-reachable DoS via crafted ASN.1 requires no authentication or interaction; impact is availability-only with scope unchanged.

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
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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: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
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 03, 2026 - 04:21 vuln.today
Analysis Generated
Aug 03, 2026 - 04:21 vuln.today
CVE Published
Aug 03, 2026 - 02:56 cve.org
HIGH 8.7

DescriptionCVE.org

In Bouncy Castle for Java before 1.85, Lazy ASN.1 sequence forcing resets nesting-depth guard. 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

Uncontrolled recursion in Bouncy Castle for Java's lazy ASN.1 parser enables remote unauthenticated denial of service across all three library release lines (bc-java, bc-lts-java, and bc-fja FIPS). When a LazyEncodedSequence is forced during tree traversal, it resets the nesting-depth guard to its configured maximum instead of continuing with the remaining depth budget, allowing crafted deeply-nested ASN.1 structures to bypass StreamUtil's recursion limit and trigger a StackOverflowError. …

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 ASN.1 with 256+ nested SEQUENCEs
Delivery
Target accepts input for lazy parse
Exploit
Shallow outer parse passes depth guard
Execution
Application triggers full tree traversal
Persist
Depth guard resets on each LazyEncodedSequence.force()
Impact
StackOverflowError crashes parsing thread
Sign in to reveal

Vulnerability AssessmentAI

Exploitation Exploitation requires that the application uses Bouncy Castle in lazy ASN.1 parsing mode (ASN1InputStream instantiated with lazyEvaluate=true) and subsequently performs a full tree traversal of the parsed object - such as calling hashCode(), equals(), re-encoding, or iterating via getObjects(). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) accurately reflects a low-complexity, unauthenticated, network-reachable denial-of-service with no confidentiality or integrity component. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted X.509 certificate or CMS-signed message containing 256 or more nested SEQUENCE elements to a server that uses Bouncy Castle for TLS certificate validation or signature verification. The initial lazy parse at the network layer succeeds because only the outermost level is decoded eagerly. …
Remediation Upgrade to the patched releases as appropriate for your dependency: bc-java 1.85 or later, bc-lts-java 2.73.12 or later, or 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.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, conduct an inventory of all applications, libraries, and services using Bouncy Castle and obtain the patched version from the Bouncy Castle vendor advisory. …

Sign in for detailed remediation steps and compensating controls.

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-674 – Uncontrolled Recursion

View all
CVE-2019-9545 HIGH POC
8.8
CVE-2019-9543 HIGH POC
8.8
CVE-2019-9144 HIGH POC
8.8
CVE-2019-9143 HIGH POC
8.8
CVE-2026-9769 HIGH POC
8.7
CVE-2026-40345 HIGH POC
8.2
CVE-2025-9624 HIGH POC
8.3
CVE-2019-9192 HIGH POC
7.5

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected

Share

CVE-2026-13506 vulnerability details – vuln.today
Back

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