# Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography vulnerabilities

Source: https://junglewise.ai/threats/technologies/legion-of-the-bouncy-castle-inc-bouncycastle-cryptography  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/legion-of-the-bouncy-castle-inc-bouncycastle-cryptography.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 6 vulnerabilities in Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography: 0 in the last 7 days and 6 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-63571, was published on 2 October 2026. Nothing in the last four weeks, down from 6 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 6
- All time: 6 (0 critical, 0 exploited in the wild)

## About Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography

C# cryptography library implementing algorithms for encryption, hashing, and key exchange.

## Latest Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography vulnerabilities

- [CVE-2026-63571: Bouncy Castle attribute certificate signature validation bypass](https://junglewise.ai/threats/cve-2026-63571-improper-verification-of-cryptographic-signature-in-the-attribute) (info, published 2 Oct 2026)
- [CVE-2026-103603: Bouncy Castle C# HSS/LMS memory exhaustion in public key parsing](https://junglewise.ai/threats/cve-2026-103603-memory-allocation-with-excessive-size-value-in-the-hss-lms) (info, published 2 Oct 2026)
- [CVE-2026-103601: Bouncy Castle CCM AEAD decryption plaintext disclosure](https://junglewise.ai/threats/cve-2026-103601-release-of-unverified-plaintext-in-the-ccm-ccmblockcipher-and) (info, published 2 Oct 2026)
- [CVE-2026-103600: Bouncy Castle ASN.1 parser uncontrolled recursion](https://junglewise.ai/threats/cve-2026-103600-uncontrolled-recursion-in-the-asn-1-parser-asn1inputstream) (info, published 2 Oct 2026)
- [CVE-2026-63569: Bouncy Castle C# DHAgreement improper input validation](https://junglewise.ai/threats/cve-2026-63569-improper-input-validation-in-dhagreement-calculateagreement-mti) (info, published 2 Oct 2026)
- [CVE-2026-63567: Bouncy Castle C# IesEngine padding oracle in CBC mode](https://junglewise.ai/threats/cve-2026-63567-observable-discrepancy-in-iesengine-decryptblock-in-legion-of-the) (info, published 2 Oct 2026)

## Most severe Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography vulnerabilities

- [CVE-2026-63567: Bouncy Castle C# IesEngine padding oracle in CBC mode](https://junglewise.ai/threats/cve-2026-63567-observable-discrepancy-in-iesengine-decryptblock-in-legion-of-the) (info, published 2 Oct 2026)
- [CVE-2026-103603: Bouncy Castle C# HSS/LMS memory exhaustion in public key parsing](https://junglewise.ai/threats/cve-2026-103603-memory-allocation-with-excessive-size-value-in-the-hss-lms) (info, published 2 Oct 2026)
- [CVE-2026-63569: Bouncy Castle C# DHAgreement improper input validation](https://junglewise.ai/threats/cve-2026-63569-improper-input-validation-in-dhagreement-calculateagreement-mti) (info, published 2 Oct 2026)
- [CVE-2026-103600: Bouncy Castle ASN.1 parser uncontrolled recursion](https://junglewise.ai/threats/cve-2026-103600-uncontrolled-recursion-in-the-asn-1-parser-asn1inputstream) (info, published 2 Oct 2026)
- [CVE-2026-103601: Bouncy Castle CCM AEAD decryption plaintext disclosure](https://junglewise.ai/threats/cve-2026-103601-release-of-unverified-plaintext-in-the-ccm-ccmblockcipher-and) (info, published 2 Oct 2026)
- [CVE-2026-63571: Bouncy Castle attribute certificate signature validation bypass](https://junglewise.ai/threats/cve-2026-63571-improper-verification-of-cryptographic-signature-in-the-attribute) (info, published 2 Oct 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 6 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 6 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Legion of the Bouncy Castle Inc. technologies

- [Legion of the Bouncy Castle Inc. Bc-Csharp](https://junglewise.ai/threats/technologies/bc-csharp): 3 vulnerabilities
- [Legion of the Bouncy Castle Inc. Bouncy Castle Java Cryptography APIs](https://junglewise.ai/threats/technologies/bc-java): 3 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Legion of the Bouncy Castle Inc. BouncyCastle.Cryptography vulnerabilities", https://junglewise.ai/threats/technologies/legion-of-the-bouncy-castle-inc-bouncycastle-cryptography, 9 November 2026.