CVE-2026-12802CWE-354

CVE-2026-12802

High · published August 3, 2026

CVSS v3.1

7.5

EPSS

Percentile

3.6

In the wild

Unconfirmed

What it is

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).

The record

Technical detail

CVSS v3.1: 7.5 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0: Not supplied
EPSS: 0.00147 · 3.6th percentile
Weakness: CWE-354 · Improper Validation of Integrity Check Value
Published: 2026-08-03T08:16Z

Affected products (5)

Product	Versions	Fixed in
bouncycastle/bc-java	< 1.85	1.85
bouncycastle/bcpkix-fips	< 1.0.12	1.0.12
bouncycastle/bcpkix-fips	≥ 2.0.7, < 2.0.12	2.0.12
bouncycastle/bcpkix-fips	≥ 2.1.8, < 2.1.12	2.1.12
bouncycastle/bouncy_castle_for_java_lts	≤ 2.73.11	—

References (2)

https://github.com/bcgit/bc-java/commit/0fefa539e6ac5c66e1daee5a13b23d1d4769cc01 · 91579145-5d7b-4cc5-b925-a0262ff19630 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012802 · 91579145-5d7b-4cc5-b925-a0262ff19630

EPSS history

Timeline

03 AUG 02:48Z
CMS AuthEnvelopedData fails to enforce tag-length on decryption
cvelistv5