High [CVE-2026-87824] Denial of Service (DoS) via out-of-bounds read in Zstd.trainFromBufferDirect
This high-severity Red Hat Linux advisory covers CVE-2026-87824 affecting Exploit Intelligence, OpenShift Developer Tools and Services, Red Hat build of Apache Camel 4 for Quarkus 3.
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Summary
A flaw was found in zstd-jni. Attackers can exploit this by supplying oversized per-sample lengths to the `Zstd.trainFromBufferDirect` function, which fails to validate the samples buffer capacity.
This allows for reading past buffer boundaries, leading to out-of-bounds memory access and ultimately causing the Java Virtual Machine (JVM) to terminate, resulting in a Denial of Service (DoS). The vulnerability can allow a remote attacker to terminate the Java Virtual Machine by supplying crafted sample lengths to the dictionary-training function.
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-125.
Affected Red Hat products: Exploit Intelligence; OpenShift Developer Tools and Services; 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 Debezium 3; Red Hat build of Quarkus; Red Hat Ceph Storage 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Fuse 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift AI (RHOAI).
Red Hat lists Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: jmc.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 1.5.7-14
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- No complete workaround is currently available. As a temporary measure, applications using Zstd.trainFromBufferDirect() should validate that all sample lengths are non-negative and that their total does not exceed the capacity of the samples buffer before calling the function. Avoid passing attacker-controlled sample length arrays to this function until an update is available. Upgrade to a Red Hat product release containing zstd-jni 1.5.7-14 or later when available.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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