CVE-2026-13506
Received Received - Intake

Lazy ASN.1 Sequence Nesting Depth Reset in Bouncy Castle

Publication date: 2026-08-03

Last updated on: 2026-08-03

Assigner: bcorg

Description
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).

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Meta Information

Published
2026-08-03
Last Modified
2026-08-03
Generated
2026-08-03
AI Q&A
2026-08-03
EPSS Evaluated
N/A
NVD
CVE-2026-13506
EUVD
EUVD-2026-52139

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
bouncy_castle bouncy_castle_for_java to 1.85 (exc)
bouncy_castle bouncy_castle_for_java_lts to 2.73.12 (exc)
bouncy_castle bc_fips to 1.0.2.7 (exc)
bouncy_castle bc_fips to 2.0.2 (exc)
bouncy_castle bc_fips to 2.1.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-674 The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Attack-Flow Graph

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Executive Summary

This vulnerability in Bouncy Castle for Java involves a flaw where Lazy ASN.1 sequence forcing resets a nesting-depth guard. This allows potential attacks to bypass security checks by manipulating nested data structures.

Detection Guidance

This vulnerability is specific to Bouncy Castle Java libraries and cannot be directly detected via network or system commands. Instead, check the version of Bouncy Castle libraries in use. If using Maven, run: mvn dependency:tree | grep bouncycastle. For Gradle: gradle dependencies | grep bouncycastle. Ensure versions are 1.85 or later for standard, 2.73.12 for LTS, or specified FIPS versions.

Impact Analysis

An attacker could exploit this to cause a denial of service or execute arbitrary code by crafting malicious ASN.1 sequences. Systems using vulnerable versions of Bouncy Castle may be at risk of crashes or unauthorized access.

Compliance Impact

The vulnerability in Bouncy Castle for Java could potentially impact compliance with standards like GDPR and HIPAA by exposing systems to deeper nesting attacks that may lead to denial of service or other security breaches. However, the provided CVE data does not explicitly detail compliance impacts.

Mitigation Strategies

Update Bouncy Castle for Java to version 1.85 or later, Bouncy Castle for Java LTS to 2.73.12 or later, and BC-FJA to the latest supported version in your series (1.0.2.7, 2.0.2, or 2.1.3).

Review and remove any custom ASN.1 parsing logic that may rely on lazy sequence handling.

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