Quadratic-Time Vulnerability in Bouncy Castle for Java Affects Multiple Versions
CVE-2026-58059

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-2026-58059?

A quadratic-time escaping vulnerability exists in Bouncy Castle for Java prior to version 1.85. This vulnerability manifests when stringifying X.500 distinguished names, leading to potential performance degradation and denial of service under certain conditions. The issue impacts the LTS and FIPS versions of Bouncy Castle, stressing the importance of updating to mitigate risks associated with this vulnerability.

Affected Version(s)

BC-FJA all 1.0.0 < 1.0.2.7

BC-FJA all 2.0.0 < 2.0.2

BC-FJA all 2.1.0 < 2.1.3

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2...
vendor-advisory
https://github.com/bcgit/bc-java/commit/7bf20eea8c1b71a4d...
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
.