CVE-2026-12816CWE-354

CVE-2026-12816

High · published August 3, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
7.1
In the wild
Unconfirmed
What it is

In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

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
0.00179 · 7.1th percentile
Weakness
CWE-354 · Improper Validation of Integrity Check Value
Published
2026-08-03T08:16Z
Affected products (2)
ProductVersionsFixed in
bouncycastle/bc-java< 1.851.85
bouncycastle/bouncy_castle_for_java_lts≤ 2.73.11—
References (2)
https://github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084ac · 91579145-5d7b-4cc5-b925-a0262ff19630https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012816 · 91579145-5d7b-4cc5-b925-a0262ff19630
EPSS history
Timeline
  • 03 AUG 02:53Z
    IESEngine stream-mode MAC forgery via length-dependent KDF split
    cvelistv5