CVE-2026-59646

Weakness

In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

Affected products

• bouncycastle bc-java
• bouncycastle bctls-fips
• bouncycastle bouncy_castle_for_java_lts

References

• https://github.com/bcgit/bc-java/commit/2d98721e71bbd822ffa0f84e088eea645cf679fa
• https://github.com/bcgit/bc-java/commit/2ea38942c7917f6d7ab4de93d8a5336d021df0d9
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059646