{"answers":{"affected":"5 open source packages ship an affected version, including h2o and ai.h2o:h2o-core. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6544 exists.","fix":"No fix has been published for CVE-2025-6544 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-6544 is a critical unsafe deserialization vulnerability in h2oai/h2o-3, published on 21 Sep 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-2025-6544 and fix it if it is affected.\n\nWhat it is: CVE-2025-6544 is a critical unsafe deserialization vulnerability in h2oai/h2o-3, published on 21 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6544 exists.\n\nAffected packages and fixed versions:\n- h2o (PyPI): affected all versions up to 3.46.0.7; no fix listed\n- h2o (PyPI): affected all versions up to 3.46.0.7; no fix listed\n- h2o (PyPI): affected all versions up to 3.46.0.7; no fix listed\n- ai.h2o:h2o-core (Maven): affected all versions up to 3.46.0.7; no fix listed\n- ai.h2o:h2o-core (Maven): affected all versions up to 3.46.0.7; 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-2025-6544/ (Markdown: https://insights.sbomify.com/CVE-2025-6544/index.md)","id":"CVE-2025-6544","markdown":"https://insights.sbomify.com/CVE-2025-6544/index.md","name":"CVE-2025-6544","record":{"aliases":["GHSA-5w3j-gwgh-4rfv","PYSEC-2026-349"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"H2O-3 machine learning library","requires_auth":"none","summary":"Attackers can execute arbitrary code and read system files via deserialization flaws in H2O-3 JDBC connection parameters.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntr_ai","cpe":[{"product":"h2o","vendor":"h2o"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"A deserialization vulnerability exists in h2oai/h2o-3 versions \u003c= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.","ecosystems":["Maven","PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"Deserialization Vulnerability in h2oai/h2o-3","id":"CVE-2025-6544","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"deserialization","year":"2025"},"n_packages":5,"n_references":2,"next":{"headline":"pbkdf2 returns predictable uninitialized/zero-filled memory for non-normalized or unimplemented algos","id":"CVE-2025-6545"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["3.46.0.7"],"package":"ai.h2o:h2o-core","purl":null,"source":"GHSA-5w3j-gwgh-4rfv"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["3.46.0.7"],"package":"ai.h2o:h2o-core","purl":"pkg:maven/ai.h2o/h2o-core","source":"GHSA-5w3j-gwgh-4rfv"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.46.0.7"],"package":"h2o","purl":null,"source":"GHSA-5w3j-gwgh-4rfv"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.46.0.7"],"package":"h2o","purl":"pkg:pypi/h2o","source":"GHSA-5w3j-gwgh-4rfv"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.46.0.7"],"package":"h2o","purl":"pkg:pypi/h2o","source":"PYSEC-2026-349"}],"prev":{"headline":"Citrix NetScaler ADC and Gateway Buffer Overflow","id":"CVE-2025-6543"},"products":["h2oai/h2o-3"],"published":"2025-09-21","related":[{"cvss_score":10,"headline":"H2O Remote Code Execution via POJO Model Import","id":"CVE-2023-6016","kev_date_added":null,"published":"2023-11-16"},{"cvss_score":9.8,"headline":"Jdbc Deserialization in h2oai/h2o-3","id":"CVE-2024-10553","kev_date_added":null,"published":"2025-03-20"},{"cvss_score":9.3,"headline":"External Control of File Name or Path in h2oai/h2o-3","id":"CVE-2023-6569","kev_date_added":null,"published":"2023-12-14"},{"cvss_score":9.3,"headline":"H2O Local File Include","id":"CVE-2023-6013","kev_date_added":null,"published":"2023-11-16"},{"cvss_score":9.3,"headline":"Local File Inclusion in h2oai/h2o-3","id":"CVE-2023-6038","kev_date_added":null,"published":"2023-11-16"},{"cvss_score":9.1,"headline":"H2O.ai H2O vulnerable to deserialization attacks via a JDBC Connection URL","id":"CVE-2024-45758","kev_date_added":null,"published":"2024-09-06"}],"sources":[{"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":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-09-22","vendors":["h2oai"]},"summary":"Attackers can execute arbitrary code and read system files via deserialization flaws in H2O-3 JDBC connection parameters.","url":"https://insights.sbomify.com/CVE-2025-6544/"}