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TI-2026-68929 Aliases CVE-2026-106449GHSA-343h-94h5-c4wr

Uncontrolled recursion in yawkat LZ4 Java LZ4BlockInputStream

Priority LOW 18CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Partial Red Hat: 7 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-674.

Summary

yawkat LZ4 Java before 1.11.4 is affected when LZ4BlockInputStream runs with stopOnEmptyBlock set to false. The stream handles each empty block by recursively calling refill(), an uncontrolled recursion flaw (CWE-674). An unauthenticated remote attacker who supplies a compressed stream with a long run of empty blocks can exhaust the decoding thread's stack and trigger a StackOverflowError. The default setting, true, is not affected, and the issue does not cause memory corruption.

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.LZ4BlockInputStream configured with stopOnEmptyBlock set to false handles each well-formed empty LZ4Block by recursively calling refill(), allowing a long sequence of empty blocks in an attacker-controlled compressed stream to exhaust the decoding thread's stack and throw StackOverflowError. The default stopOnEmptyBlock setting is true and is not affected, and the issue does not cause memory corruption. This issue is fixed in version 1.11.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00423 36th percentileScored 2026-11-07
Fix Partial lz4-java (yawkat): 1.11.4at.yawk.lz4:lz4-java (Maven): 1.11.4Red Hat: 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
yawkatlz4-javabefore 1.11.41.11.4Patch availableCNA
—at.yawk.lz4:lz4-java (Maven)before 1.11.41.11.4Patch availableGHSA-343h-94h5-c4wr
—org.lz4:lz4-java (Maven)up to 1.8.1—No fix listedGHSA-343h-94h5-c4wr
  • 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-343h-94h5-c4wr
  • org.lz4:lz4-java (Maven) Vendor— Affected up to 1.8.1 Fixed in — No fix listed GHSA-343h-94h5-c4wr

Remediation

Upgrade yawkat LZ4 Java and the at.yawk.lz4:lz4-java Maven artifact to 1.11.4. The sources list no fixed version for org.lz4:lz4-java. Red Hat lists these products as affected without a fix: Red Hat Enterprise Linux 9 (no fix available), Red Hat Fuse 7 (no fix planned), Red Hat JBoss Enterprise Application Platform 8 (no fix available), Red Hat JBoss Enterprise Application Platform Expansion Pack (no fix available), Red Hat OpenShift AI (RHOAI) (no fix available), Red Hat build of Apache Camel for Spring Boot 4 (no fix available) and Red Hat build of Debezium 3 (no fix available).

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-343h-94h5-c4wr at.yawk.lz4:lz4-java (Maven) Fixed in 1.11.4 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Fuse 7AffectedNo fix planned: Out of support scope
Red Hat JBoss Enterprise Application Platform 8AffectedNo fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform Expansion PackAffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat build of Apache Camel for Spring Boot 4AffectedNo fix yet: Fix deferred
Red Hat build of Debezium 3AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-106449
  2. 2026-10-07 Affected versions changed · Red Hat
  3. 2026-10-07 CVSS score added · Red Hat
  4. 2026-10-07 CISA SSVC decision points changed
  5. 2026-10-07 Alias added: GHSA-343h-94h5-c4wr
  6. 2026-10-07 Fix available: Maven/at.yawk.lz4:[email protected] · GHSA-343h-94h5-c4wr
  7. 2026-10-07 CVSS score added · GHSA-343h-94h5-c4wr
  8. 2026-10-07 Weakness changed · GHSA-343h-94h5-c4wr
  9. 2026-10-07 5 new references · GHSA-343h-94h5-c4wr

References

Advisory 1

Other 4

  • 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-2026-68930 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

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences