CVE-2026-12802

In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

Score

CVSS 4.0 8.7 High

Status

Analyzed - 91579145-5d7b-4cc5-b925-a0262ff19630

Published

2026-08-03

Last modified

2026-08-03

Weaknesses

CWE-354

Affected products

• Bc-java (Bouncycastle)
• Bcpkix-fips (Bouncycastle)
• Bouncy Castle For Java Lts (Bouncycastle)
• Bc-fja (Legion Of The Bouncy Castle Inc.)
• Bc-java (Legion Of The Bouncy Castle Inc.)
• Bc-lts-java (Legion Of The Bouncy Castle Inc.)

References

• https://github.com/bcgit/bc-java/commit/0fefa539e6ac5c66e1daee5a13b23d1d4769cc01
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012802