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Bouncy Castle Java EUVDEUVD-2026-52139

| CVE-2026-13506 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
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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. …

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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
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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.
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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. …

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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

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EUVD-2026-52139 vulnerability details – vuln.today
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