High [CVE-2026-12852] Bouncy Castle for Java: Denial of Service via MLS wire decoder
This high-severity Red Hat Linux advisory covers CVE-2026-12852.
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Summary
In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bounds check. A remote attacker could exploit this by providing a specially crafted message to the MLS wire decoder.
This can lead to excessive memory allocation, resulting in a Denial of Service (DoS) for the application. This vulnerability targets the Messaging Layer Security (MLS) module, which in Bouncy Castle is packaged as bcmls.
No Red Hat products are affected. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-1284.
Red Hat lists Cryostat 4; OpenShift Developer Tools and Services; Red Hat AMQ Broker 7; Red Hat AMQ Clients; Red Hat Ansible Automation Platform 2; Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Apache Camel for Spring Boot 4; Red Hat build of Apicurio Registry 3; Red Hat Build of Keycloak; Red Hat build of Quarkus; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat JBoss Enterprise Application Platform 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4; Red Hat OpenShift Dev Spaces; Red Hat Satellite 6; Red Hat Single Sign-On 7 as not affected.
- < 1.85
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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