CVE-2026-12802: CMS AuthEnvelopedData fails to enforce tag-length on decryption
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).
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-12802?
CVE-2026-12802 has a high severity rating of 8.7 according to the CVSS scoring system.
How do I fix CVE-2026-12802?
To fix CVE-2026-12802, update Bouncy Castle for Java to version 1.85 or later, and ensure all supported LTS and FIPS versions are also updated.
What software is affected by CVE-2026-12802?
CVE-2026-12802 affects Bouncy Castle for Java, Bouncy Castle for Java LTS, and Bouncy Castle for Java FIPS versions prior to specified fixes.
What vulnerability does CVE-2026-12802 address?
CVE-2026-12802 addresses a vulnerability in CMS AuthEnvelopedData where tag-length is not enforced during decryption.
When was CVE-2026-12802 published?
CVE-2026-12802 was published on August 3, 2026.