CVE-2026-13506
7.5 · HIGHIn Bouncy Castle for Java before 1.85, Lazy ASN.1 sequence forcing resets nesting-depth guard.
Overview
CVE-2026-13506 is a high-severity vulnerability affecting bouncycastle bc-java. It was published on August 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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).
Remediation
Check the references section for vendor advisories and patches from bouncycastle. Update bc-java to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| bouncycastle | bc-java | >= 0, < 1.85 | Affected |
| bouncycastle | bouncy_castle_for_java_lts | 0 | Affected |
| bouncycastle | fips_java_api | >= 1.0.0, < 1.0.2.7 | Affected |
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Frequently asked questions
What is CVE-2026-13506?
CVE-2026-13506 is a high-severity vulnerability affecting bouncycastle bc-java. It was published on August 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-13506?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-13506?
Check the references section for vendor advisories and patches from bouncycastle. Update bc-java to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-13506?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-13506 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.
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