Vulnerability in Bouncycastle Bc-Java
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).
EPSS: 0.001 (4.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Bouncycastle Bc-java
- Bouncycastle Bcpkix-fips
- Bouncycastle Bouncy_castle_for_java_lts
- Legion Of The Bouncy Castle Inc. Bc-fja — versions 1.0.0, 2.0.0, 2.1.0
- Legion Of The Bouncy Castle Inc. Bc-java — versions 0
- Legion Of The Bouncy Castle Inc. Bc-lts-java — versions 2.73.0
Weakness classification (CWE)
References
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (Patch, patch)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-12802?
- CVE-2026-12802 is a high-severity vulnerability in Bouncycastle Bc-Java, classified under Improper Validation of Integrity Check Value. CVSS score: 7.5/10. Published 2026-08-03.
- How severe is CVE-2026-12802?
- High severity. CVSS v3 base score is 7.5 out of 10.