LZ4 Java LZ4FrameInputStream allocates memory without limits
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-770.
Summary
yawkat LZ4 Java before 1.11.4 is affected. The LZ4FrameInputStream readHeader() method allocates two new 4 MiB block buffers for each maximum-block-size frame header, without limits (CWE-770). A remote attacker who can supply a stream can send many minimal empty frames, triggering about 8 MiB of allocation per 11 input bytes, which consumes CPU and garbage-collection time while producing no decompressed output. Decompressed-size limits do not mitigate it, and readSingleFrame mode is not affected.
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. Prior to 1.11.4, net.jpountz.lz4.LZ4FrameInputStream readHeader() allocates two new 4 MiB block buffers whenever a maximum-block-size frame header is read, and the default concatenated-frame mode allows attacker-controlled streams containing many minimal empty frames to trigger roughly 8 MiB of allocation for every 11 input bytes. The stream produces no decompressed output while consuming CPU and garbage-collection time, so decompressed-size limits do not mitigate the issue; readSingleFrame mode is 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
- 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 1.11.4 | 1.11.4 | Patch available | CNA |
| — | at.yawk.lz4:lz4-java (Maven) | before 1.11.4 | 1.11.4 | Patch available | GHSA-gm45-99xc-r7wv |
| — | org.lz4:lz4-java (Maven) | up to 1.8.1 | — | No fix listed | GHSA-gm45-99xc-r7wv |
- 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-gm45-99xc-r7wv
- org.lz4:lz4-java (Maven) Vendor— Affected up to 1.8.1 Fixed in — No fix listed GHSA-gm45-99xc-r7wv
Remediation
Upgrade yawkat LZ4 Java to version 1.11.4 for the yawkat lz4-java and at.yawk.lz4:lz4-java packages. The sources list no fixed version for org.lz4:lz4-java, which is affected through 1.8.1. Red Hat rates the issue Moderate and lists no fix available for OpenShift Developer Tools and Services, Red Hat Enterprise Linux 8 and 9, and other products, with no fix planned for Red Hat Fuse 7.
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-gm45-99xc-r7wv 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-2026-106450
- 2026-10-07 Affected versions changed · Red Hat
- 2026-10-07 CVSS score added · Red Hat
- 2026-10-07 Alias added: GHSA-gm45-99xc-r7wv
- 2026-10-07 Fix available: Maven/at.yawk.lz4:[email protected] · GHSA-gm45-99xc-r7wv
- 2026-10-07 CVSS score added · GHSA-gm45-99xc-r7wv
- 2026-10-07 Weakness changed · GHSA-gm45-99xc-r7wv
- 2026-10-07 5 new references · GHSA-gm45-99xc-r7wv
- 2026-10-09 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-2026-68933 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-2026-42755 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-2026-106450 · CVE Program
- CVE-2026-106450 · NVD
- FIRST EPSS
- GHSA-gm45-99xc-r7wv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-106450 · 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