Denial of Service Vulnerability in Bouncy Castle for Java by Bouncy Castle
CVE-2026-59645

8.7HIGH

Key Information:

Vendor

Legion Of The Bouncy Castle Inc.

Status
Bc-java
Bc-lts-java
Bc-fja
Vendor
CVE Published:
3 August 2026

What is CVE-2026-59645?

The OER parser in Bouncy Castle for Java versions prior to 1.85 is susceptible to a Denial of Service (DoS) attack due to its infinite recursion on self-referential IEEE 1609.2 schemas. This vulnerability extends to the Bouncy Castle for Java LTS versions earlier than 2.73.12, and to Bouncy Castle for Java FIPS (BC-FJA) versions earlier than 2.0.7 of the 2.0.X series and 2.1.7 of the 2.1.X series. Exploiting this vulnerability may lead to potential service disruption, making it crucial for users to update to the latest versions to mitigate risks.

Affected Version(s)

BC-FJA all 2.0.0 < 2.0.7

BC-FJA all 2.1.0 < 2.1.7

BC-JAVA all 1.70 < 1.85

References

https://github.com/bcgit/bc-java/wiki/CVE-2026-59645
vendor-advisory
https://github.com/bcgit/bc-java/commit/822b2478b13109736...
patch

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alex Gaynor in collaboration with Claude and Anthropic Research
.