CVE-2026-59645 OER parser recurses without depth limit on self-referential IEEE 1609.2 schema
An attacker can cause a denial of service by triggering infinite recursion in the OER parser of the Bouncy Castle Java library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59645?
CVE-2026-59645 is a high-severity denial of service vulnerability in Bouncycastle Bc-Java, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-674
Which versions are affected by CVE-2026-59645?
It affects 3 products.
Products include Bouncycastle Bc-Java, Bouncycastle Bcutil-Fips, Bouncycastle Bouncy Castle for Java Lts.
How do I fix CVE-2026-59645?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-59645 being exploited?
There is no known exploitation of CVE-2026-59645 in the wild and no public exploit code.
Other vulnerabilities in Bouncycastle Bc-Java
- CVE-2007-6721 Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability
- CVE-2018-1000613 Deserialization of Untrusted Data in Bouncy castle
- CVE-2026-58062 Stapled OCSP response accepted without binding to the checked certificate
- CVE-2026-59638 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
- CVE-2026-59650 MTI/A0 DH agreement exponentiates unvalidated peer value
Sources
Also known as CLEANSTART-2026-CS69387, CLEANSTART-2026-MY19535, CLEANSTART-2026-NS11674, CLEANSTART-2026-TK63612, CLEANSTART-2026-XE26405, DEBIAN-CVE-2026-59645 and 2 more.