# CVE-2025-12183: lz4-java DoS — Fixed in 1.8.1 ☕ Maven Not in CISA KEV # CVE-2025-12183 — lz4-java CVE-2025-12183 is a Out-of-bounds Read vulnerability in at.yawk.lz4:lz4-java. A fix is available for at.yawk.lz4:lz4-java — see the affected versions and patch details below. org.lz4:lz4-java - Out-of-Bounds Memory Access Also known as[GHSA-vqf4-7m7x-wgfc](/vulnerability/GHSA-vqf4-7m7x-wgfc) Published Nov 28, 2025 Updated Nov 5, 2026 Affected 4 pkgs Patched 2 / 4 Exploits None indexed Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS) ## Exploitation Status ### No confirmed exploitation observed yet - CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks. - CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment. Exploitation and automatability from CISA’s SSVC triage for CVE-2025-12183. ## EPSS Exploitation Probability [via FIRST.org ↗](https://www.first.org/epss/) 0.7%probability of exploitation in next 30 days Lower Risk0.00% Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk 0.00%0.42%0.83%1.25%0.1%0.7%May 26Sep 26Nov 26 Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/). ## Real-World Exposure 4 pkgs affected ☕`at.yawk.lz4:lz4-java`☕`org.lz4:lz4-java`☕`org.lz4:lz4-pure-java`☕`net.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. This is fixed in a forked release: at.yawk.lz4:lz4-java version 1.8.1. The original project has been archived: [https://github.com/lz4/lz4-java](https://github.com/lz4/lz4-java), and Sonatype has added a redirect from org.lz4:lz4-java:1.8.1 to the new group ID. ## Affected Packages 4 total 2 fixed Ecosystem Package Vulnerable range Fix ☕Maven `at.yawk.lz4:lz4-java` all versions 1.8.1`at.yawk.lz4:lz4-java:1.8.1` ☕Maven `org.lz4:lz4-java` all versions 1.8.1`org.lz4:lz4-java:1.8.1` ☕Maven `org.lz4:lz4-pure-java` all versions No fix ☕Maven `net.jpountz.lz4:lz4` all versions No 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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version. 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 Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process. ## Fixing This On Your OS If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project. Red HatModerate This vulnerability affects the "fast" decompressor, this is due to the fact such implementation relies on LZ4\_decompress\_fast API of the lz4 C library. This function was deprecated in the lz4 library as it misses boundary checks and is considered insecure when processing untrusted inputs. Red Hat has considered this… Workaround published by Red Hat > Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Source: [Red Hat security advisory for CVE-2025-12183](https://access.redhat.com/security/cve/cve-2025-12183) (CC BY 4.0) Product Fixed in Advisory Red Hat build of Quarkus 3.20.4.SP1 `lz4-java` [RHSA-2026:0131](https://access.redhat.com/errata/RHSA-2026:0131) Red Hat build of Quarkus 3.27.1.SP1 `lz4-java` [RHSA-2026:0134](https://access.redhat.com/errata/RHSA-2026:0134) ## 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. This is fixed in a forked release: at.yawk.lz4:lz4-java version 1.8.1. The original project has been archived: https://github.com/lz4/lz4-java, and Sonatype has added a redirect from org.lz4:lz4-java:1.8.1 to the new group ID. O3 Security · Impact-Aware SCA ### Is CVE-2025-12183 in your dependencies? Find it across Maven, including transitive dependencies. 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