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CVE-2026-59645: OER parser recurses without depth limit on self-referential IEEE 1609.2 schema

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-03 · updated 2026-08-28
• Weakness: CWE-674

Description

In Bouncy Castle for Java before 1.85, OER parser recurses without depth limit on self-referential IEEE 1609.2 schema. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcutil-fips 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

Affected products

• Legion of the Bouncy Castle Inc. BC-JAVA: before 1.85 — fixed in 1.85
• Bouncycastle Bcutil-Fips: from 2.0.2 before 2.0.7; from 2.1.4 before 2.1.7 — fixed in 2.0.7, 2.1.7
• Legion of the Bouncy Castle Inc. Bouncy Castle for Java LTS: through 2.73.11

How to fix

Upgrade to a fixed version: Legion of the Bouncy Castle Inc. BC-JAVA 1.85; Bouncycastle Bcutil-Fips 2.0.7, 2.1.7. Check the vendor advisory for mitigations.

References

• https://github.com/bcgit/bc-java/commit/822b2478b131097368a56290f5728e28dd042989
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059645

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