CVE-2023-33202: Bouncycastle Bouncy Castle For Java

Medium severity, CVSS 5.5. EPSS: 1% chance of exploitation in the next 30 days.

Bouncy Castle for Java before 1.73 contains a potential Denial of Service (DoS) issue within the Bouncy Castle org.bouncycastle.openssl.PEMParser class. This class parses OpenSSL PEM encoded streams containing X.509 certificates, PKCS8 encoded keys, and PKCS7 objects. Parsing a file that has crafted ASN.1 data through the PEMParser causes an OutOfMemoryError, which can enable a denial of service attack. (For users of the FIPS Java API: BC-FJA 1.0.2.3 and earlier are affected; BC-FJA 1.0.2.4 is fixed.)

Affected products

• Bouncycastle Bouncy Castle For Java: before 1.73 (fixed in 1.73)
• Bouncycastle Fips Java API: before 1.0.2.4 (fixed in 1.0.2.4)

Published 2023-11-23. Last modified 2026-06-17.