CVE-2026-12852CWE-789

CVE-2026-12852

High · published August 3, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
22.6
In the wild
Unconfirmed
What it is

In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bounds check.

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:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00310 · 22.6th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-08-03T08:16Z
Affected products (1)
ProductVersionsFixed in
bouncycastle/bc-java< 1.851.85
References (2)
https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790 · 91579145-5d7b-4cc5-b925-a0262ff19630https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012852 · 91579145-5d7b-4cc5-b925-a0262ff19630
EPSS history
Timeline
  • 03 AUG 02:55Z
    MLS wire decoder allocates attacker-declared opaque length before bounds check
    cvelistv5