LZ4 Java native library extraction allows local file replacement
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 13 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
The yawkat LZ4 Java library from 1.7.0 before 1.11.4 is affected. Native.load() extracts the native library to a predictable path in a shared temporary directory, which lets another local user create or replace the file before it loads (CWE-367). A local user with access to that directory can run native code as the victim, although hardened systems may only cause library loading to fail.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
yawkat LZ4 Java provides LZ4 compression for Java. From 1.7.0 until 1.11.4, net.jpountz.util.Native.load() uses File.createTempFile to create an exclusive temporary .lck file but derives the native-library path by removing the suffix, then FileOutputStream opens that predictable path without exclusive creation, allowing another local user with access to the same shared temporary directory to create or replace the library file before System.load() uses it. Successful exploitation depends on shared-directory permissions, host protections, and winning the race, and can execute native code as the victim; hardened systems may instead cause library loading to fail and fall back to Java implementations. Configurations using a system library, a private java.io.tmpdir, or Java-only implementations are not affected. This issue is fixed in version 1.11.4.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| yawkat | lz4-java | before 1.11.4 | 1.11.4 | Patch available | CNA |
| — | at.yawk.lz4:lz4-java (Maven) | before 1.11.4 | 1.11.4 | Patch available | GHSA-mcr4-qmvw-px4g |
| — | org.lz4:lz4-java (Maven) | 1.7.0 – 1.8.1 | — | No fix listed | GHSA-mcr4-qmvw-px4g |
- lz4-java Vendoryawkat Affected before 1.11.4 Fixed in 1.11.4 Patch available CNA
- at.yawk.lz4:lz4-java (Maven) Vendor— Affected before 1.11.4 Fixed in 1.11.4 Patch available GHSA-mcr4-qmvw-px4g
- org.lz4:lz4-java (Maven) Vendor— Affected 1.7.0 – 1.8.1 Fixed in — No fix listed GHSA-mcr4-qmvw-px4g
Remediation
Upgrade yawkat lz4-java and at.yawkat:lz4-java to version 1.11.4. The sources list no fixed version for org.lz4:lz4-java. Red Hat lists no fix planned for Red Hat Fuse 7 and no fix available for Red Hat Enterprise Linux 8 and 9, OpenShift Developer Tools and Services, and other Red Hat products.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA lz4-java (yawkat) Fixed in 1.11.4
- Fix · GHSA-mcr4-qmvw-px4g at.yawk.lz4:lz4-java (Maven) Fixed in 1.11.4 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Developer Tools and Services | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Fuse 7 | Affected | No fix planned: Out of support scope |
| Red Hat Hardened Images | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform 8 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet: Fix deferred |
| Red Hat build of Apache Camel 4 for Quarkus 3 | Affected | No fix yet: Fix deferred |
| Red Hat build of Apache Camel for Spring Boot 4 | Affected | No fix yet: Fix deferred |
| Red Hat build of Apicurio Registry 3 | Affected | No fix yet: Fix deferred |
| Red Hat build of Debezium 3 | Affected | No fix yet: Fix deferred |
| Red Hat build of Quarkus | Affected | No fix yet |
Timeline
- 2026-10-06 Threatist record created from CVE-2026-106451
- 2026-10-07 Affected versions changed · Red Hat
- 2026-10-07 CVSS score added · Red Hat
- 2026-10-07 CISA SSVC decision points changed
- 2026-10-07 Priority changed: MEDIUM → LOW
- 2026-10-07 Alias added: GHSA-mcr4-qmvw-px4g
- 2026-10-07 Fix available: Maven/at.yawk.lz4:[email protected] · GHSA-mcr4-qmvw-px4g
- 2026-10-07 CVSS score added · GHSA-mcr4-qmvw-px4g
- 2026-10-07 Weakness changed · GHSA-mcr4-qmvw-px4g
- 2026-10-07 5 new references · GHSA-mcr4-qmvw-px4g
- 2026-10-13 Affected versions changed · Red Hat
References
More yawkat vulnerabilities
- TI-2025-40977 yawkat LZ4 Java has a possible information leak in Java safe decompressor CVSS 4.0HIGH 8.2
- TI-2026-68933 LZ4 Java decompressor allocates memory from untrusted length header CVSS 3.1MEDIUM 5.3
- TI-2026-68932 Excessive memory allocation in LZ4 Java stream reader CVSS 3.1MEDIUM 5.3
- TI-2026-68930 LZ4 Java LZ4FrameInputStream allocates memory without limits CVSS 3.1MEDIUM 5.3
- TI-2026-42755 NULL pointer dereference in yawkat lz4-java CVSS 3.1MEDIUM 6.5
- TI-2026-68929 Uncontrolled recursion in yawkat LZ4 Java LZ4BlockInputStream CVSS 3.1LOW 3.7
Sources
- CVE-2026-106451 · CVE Program
- CVE-2026-106451 · NVD
- FIRST EPSS
- GHSA-mcr4-qmvw-px4g · GitHub Advisory Database · CC BY 4.0
- CVE-2026-106451 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences