LZ4 Java decompressor allocates memory from untrusted length header
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 13 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-789.
Summary
The yawkat LZ4 Java library before 1.11.2 trusts the four-byte length header in LZ4DecompressorWithLength before validating the input (CWE-789). A remote, unauthenticated attacker can send a five-byte input that declares a large output size, exhausting the JVM heap. Convenience overloads using LZ4FastDecompressor or LZ4SafeDecompressor are affected.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte decompressed-length header before validating the compressed input, allowing a five-byte attacker-supplied input whose header declares a large output size to request up to approximately 2 GiB and exhaust the JVM heap. Convenience overloads backed by LZ4FastDecompressor or LZ4SafeDecompressor allocate the untrusted size, while overloads that write to a caller-provided destination buffer are not affected because the caller controls the destination size. This issue is fixed in version 1.11.2.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
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 1.11.2 | 1.11.2 | Patch available | CNA |
| — | at.yawk.lz4:lz4-java (Maven) | before 1.11.2 | 1.11.2 | Patch available | GHSA-6cx8-rjf8-pr8g |
| — | org.lz4:lz4-java (Maven) | up to 1.8.1 | — | No fix listed | GHSA-6cx8-rjf8-pr8g |
- lz4-java Vendoryawkat Affected before 1.11.2 Fixed in 1.11.2 Patch available CNA
- at.yawk.lz4:lz4-java (Maven) Vendor— Affected before 1.11.2 Fixed in 1.11.2 Patch available GHSA-6cx8-rjf8-pr8g
- org.lz4:lz4-java (Maven) Vendor— Affected up to 1.8.1 Fixed in — No fix listed GHSA-6cx8-rjf8-pr8g
Remediation
Upgrade at.yawk.lz4:lz4-java to version 1.11.2, which contains the fix. The sources list no fixed version for yawkat lz4-java and org.lz4:lz4-java, which is affected through 1.8.1. Red Hat rates this Moderate, lists no fix available for Red Hat Enterprise Linux 8 and 9, and plans no fix for Red Hat Fuse 7.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA lz4-java (yawkat) Fixed in 1.11.2
- Fix · GHSA-6cx8-rjf8-pr8g at.yawk.lz4:lz4-java (Maven) Fixed in 1.11.2 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-2026-106453
- 2026-10-07 Affected versions changed · Red Hat
- 2026-10-07 CVSS score added · Red Hat
- 2026-10-07 Alias added: GHSA-6cx8-rjf8-pr8g
- 2026-10-07 Fix available: Maven/at.yawk.lz4:[email protected] · GHSA-6cx8-rjf8-pr8g
- 2026-10-07 CVSS score added · GHSA-6cx8-rjf8-pr8g
- 2026-10-07 Weakness changed · GHSA-6cx8-rjf8-pr8g
- 2026-10-07 5 new references · GHSA-6cx8-rjf8-pr8g
- 2026-10-07 CISA SSVC decision points changed
- 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-2026-68931 LZ4 Java native library extraction allows local file replacement CVSS 4.0HIGH 7.3
- 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-2026-106453 · CVE Program
- CVE-2026-106453 · NVD
- FIRST EPSS
- GHSA-6cx8-rjf8-pr8g · GitHub Advisory Database · CC BY 4.0
- CVE-2026-106453 · 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