{"answers":{"affected":"8 open source packages ship an affected version, including at.yawk.lz4:lz4-java, net.jpountz.lz4:lz4 and org.lz4:lz4-java.","exploited":"There is no known exploitation of CVE-2025-66566 in the wild and no public exploit code.","fix":"Upgrade at.yawk.lz4:lz4-java to 1.10.1 or later.","what":"CVE-2025-66566 is a high-severity vulnerability in yawkat lz4-java, published on 5 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-66566 and fix it if it is affected.\n\nWhat it is: CVE-2025-66566 is a high-severity vulnerability in yawkat lz4-java, published on 5 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-66566 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- at.yawk.lz4:lz4-java (Maven): affected all versions; fixed in 1.10.1\n- at.yawk.lz4:lz4-java (Maven): affected all versions; fixed in 1.10.1\n- net.jpountz.lz4:lz4 (Maven): affected all versions up to 1.8.1; no fix listed\n- net.jpountz.lz4:lz4 (Maven): affected all versions up to 1.8.1; no fix listed\n- org.lz4:lz4-java (Maven): affected all versions up to 1.8.1; no fix listed\n- org.lz4:lz4-java (Maven): affected all versions up to 1.8.1; no fix listed\n- org.lz4:lz4-pure-java (Maven): affected all versions up to 1.8.1; no fix listed\n- org.lz4:lz4-pure-java (Maven): affected all versions up to 1.8.1; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-66566/ (Markdown: https://insights.sbomify.com/CVE-2025-66566/index.md)","id":"CVE-2025-66566","markdown":"https://insights.sbomify.com/CVE-2025-66566/index.md","name":"CVE-2025-66566","record":{"aliases":["ALSA-2026:0752","CLEANSTART-2026-MK18357","CLEANSTART-2026-UB44506","CLEANSTART-2026-YG17751","CLSA-2026-1770768563","DEBIAN-CVE-2025-66566","ECHO-a02e-e8de-2b03","GHSA-cmp6-m4wj-q63q","MINI-2f7h-3rmg-4wgf","MINI-43rm-p9j2-6p4g","MINI-4fjw-6j78-5g29","MINI-4wcv-qpqv-86m2","MINI-53hq-9m3x-rmr7","MINI-54gr-qf55-g8qm","MINI-5whh-jv2j-7vv4","MINI-6gqw-vxjc-qchh","MINI-6mwx-9x8c-2xgq","MINI-6w6x-mv2c-33vv","MINI-73cg-gc4j-24j5","MINI-75xv-87mp-526g","MINI-76xq-hp58-m2xc","MINI-773p-h3hm-4wrg","MINI-7crp-hjcv-m9cp","MINI-84p5-f3h8-hg24","MINI-8c88-m388-mgxw","MINI-8xq4-prfp-46mg","MINI-934g-wjpw-phcp","MINI-96fh-5763-6gx2","MINI-96vq-952f-9jgx","MINI-9gmp-77hw-f8mx","MINI-9mwv-9x7w-r4p8","MINI-cf7q-9frv-7pwr","MINI-cqqq-c96x-4fc7","MINI-cr6x-96wp-gmcc","MINI-crg6-vcpq-4mmp","MINI-cw6r-9796-gc3v","MINI-f4vg-5gcg-wj9x","MINI-fjwx-hf3f-5h7h","MINI-g2qc-2877-gg33","MINI-h6mv-wxj3-c435","MINI-h6xp-wxf5-q63w","MINI-hjqm-hh8w-hm4c","MINI-hwmw-mvmp-5rv6","MINI-jm4c-wrwf-9jp3","MINI-p23x-6845-rgwg","MINI-p4mq-5jg9-hhwh","MINI-pphw-wm2c-g8q2","MINI-q452-r37h-j9cm","MINI-q9fp-336q-77q6","MINI-qcx9-v9qh-qp2f","MINI-qjpj-mwwr-pp8r","MINI-qv6c-qhrg-8548","MINI-r66h-26mg-jm67","MINI-rqgg-m655-vxg3","MINI-w6cc-6p9c-mqx8","MINI-w9m7-7352-5vj8","MINI-w9p6-45gr-7xfw","MINI-wvq8-jwpr-hhh9","RHSA-2026:0751","RHSA-2026:0752","RHSA-2026:1823","RLSA-2026:0752","ROOT-APP-MAVEN-CVE-2025-66566","UBUNTU-CVE-2025-66566"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Java LZ4 compression library","requires_auth":"none","summary":"Remote attackers can read sensitive data from previous buffer contents via crafted compressed input in the Java safe decompressor.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-201","name":"Insertion of Sensitive Information Into Sent Data"}],"description":"yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data. JNI-based implementations are not affected. This vulnerability is fixed in 1.10.1.","ecosystems":["AlmaLinux:9","Maven","Red Hat:enterprise_linux:9::crb","Red Hat:rhel_eus:9.4::crb","Red Hat:rhel_eus:9.6::crb","Rocky Linux:9"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"yawkat LZ4 Java has a possible information leak in Java safe decompressor","id":"CVE-2025-66566","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"information_disclosure","year":"2025"},"n_packages":13,"n_references":2,"next":{"headline":"ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","id":"CVE-2025-66567"},"packages":[{"ecosystem":"Maven","fixed":["1.10.1"],"introduced":["0"],"last_affected":[],"package":"at.yawk.lz4:lz4-java","purl":null,"source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":["1.10.1"],"introduced":["0"],"last_affected":[],"package":"at.yawk.lz4:lz4-java","purl":"pkg:maven/at.yawk.lz4/lz4-java","source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"net.jpountz.lz4:lz4","purl":null,"source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"net.jpountz.lz4:lz4","purl":"pkg:maven/net.jpountz.lz4/lz4","source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"org.lz4:lz4-java","purl":null,"source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"org.lz4:lz4-java","purl":"pkg:maven/org.lz4/lz4-java","source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"org.lz4:lz4-pure-java","purl":null,"source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["1.8.1"],"package":"org.lz4:lz4-pure-java","purl":"pkg:maven/org.lz4/lz4-pure-java","source":"GHSA-cmp6-m4wj-q63q"},{"ecosystem":"AlmaLinux:9","fixed":["8.2.0-18.el9_7.2"],"introduced":["0"],"last_affected":[],"package":"jmc","purl":"pkg:rpm/almalinux/jmc","source":"ALSA-2026:0752"},{"ecosystem":"Red Hat:enterprise_linux:9::crb","fixed":["0:8.2.0-18.el9_7.2"],"introduced":["0"],"last_affected":[],"package":"jmc","purl":"pkg:rpm/redhat/jmc","source":"RHSA-2026:0752"},{"ecosystem":"Red Hat:rhel_eus:9.4::crb","fixed":["0:8.2.0-17.el9_4.2"],"introduced":["0"],"last_affected":[],"package":"jmc","purl":"pkg:rpm/redhat/jmc","source":"RHSA-2026:1823"},{"ecosystem":"Red Hat:rhel_eus:9.6::crb","fixed":["0:8.2.0-18.el9_6.2"],"introduced":["0"],"last_affected":[],"package":"jmc","purl":"pkg:rpm/redhat/jmc","source":"RHSA-2026:0751"},{"ecosystem":"Rocky Linux:9","fixed":["0:8.2.0-18.el9_7.2"],"introduced":["0"],"last_affected":[],"package":"jmc","purl":"pkg:rpm/rocky-linux/jmc?distro=rocky-linux-9\u0026epoch=0","source":"RLSA-2026:0752"}],"prev":{"headline":"Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values","id":"CVE-2025-66565"},"products":["lz4-java"],"published":"2025-12-05","related":[],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-12-05","vendors":["yawkat"]},"summary":"Remote attackers can read sensitive data from previous buffer contents via crafted compressed input in the Java safe decompressor.","url":"https://insights.sbomify.com/CVE-2025-66566/"}