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Advisory record · GHSA-4v53-57pg-c464

yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header

CVSS 5.3 MediumEPSS 0.0045 · 39th 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-4v53-57pg-c464 · CVE-2026-106452
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.

GHSA advisory: at.yawkat lz4-java before 1.11.2 has an issue where LZ4BlockInputStream allocates a compressed-input buffer sized by the compressedLen value in a legacy LZ4Block stream header before reading any payload. An attacker who can supply such a stream to an application can send a header-only input that triggers a near-2 GiB allocation and exhausts the JVM heap, causing denial of service with no valid payload needed. Upgrade to at.yawkat lz4-java 1.11.2, which rejects oversized blocks; the org.lz4 lz4-java package (1.8.1 and earlier) has no fixed version listed.

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 0.0045, the 39th 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.