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CVE-2025-12183

CVE-2025-12183 is a Out-of-bounds Read vulnerability in at.yawk.lz4:lz4-java. O3 Security confirms whether CVE-2025-12183 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

org.lz4:lz4-java - Out-of-Bounds Memory Access

Also known asGHSA-vqf4-7m7x-wgfc
Published
Nov 28, 2025
Updated
Jul 15, 2026
Affected
4 pkgs
Patched
2 / 4
Exploits
None indexed

Real-World Exposure

4 pkgs affected
at.yawk.lz4:lz4-javaorg.lz4:lz4-javaorg.lz4:lz4-pure-javanet.jpountz.lz4:lz4

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

4 total 2 fixed
EcosystemPackageVulnerable rangeFix
Mavenat.yawk.lz4:lz4-javaall versions1.8.1
Mavenorg.lz4:lz4-javaall versions1.8.1
Mavenorg.lz4:lz4-pure-javaall versionsNo fix
Mavennet.jpountz.lz4:lz4all versionsNo fix

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for at.yawk.lz4:lz4-java. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update at.yawk.lz4:lz4-java to 1.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-12183 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2025-12183 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2025-12183. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2025-12183 in your dependencies?

O3 detects CVE-2025-12183 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.