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Advisory record · GHSA-6cx8-rjf8-pr8g

yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError

CVSS 5.3 MediumEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 7 Oct 2026, 16:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
at.yawk.lz4:lz4-javaMaven<1.11.21.11.2
org.lz4:lz4-javaMaven<=1.8.1No fixed version yet
Identifiers
GHSA-6cx8-rjf8-pr8g · CVE-2026-106453
Weakness (CWE)
CWE-789
Tags
Published
7 Oct 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of at.yawkat LZ4 Java before 1.11.2 are affected; the fix is in 1.11.2, so upgrade to that version. The org.lz4:lz4-java package at 1.8.1 and earlier is also affected, and the source lists no fixed version for it. In both cases, an attacker who can supply LZ4 data to the decompressor's length-header convenience methods can send a 5-byte input that makes the JVM allocate up to about 1 GiB, which can cause an OutOfMemoryError or heap exhaustion. Wait, that's a fourth sentence; I need to keep to two or three.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.