{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-3870 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-3870 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-3870 is a medium-severity memory corruption vulnerability in Zyxel VMG4005-B50B firmware, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-3870 and fix it if it is affected.\n\nWhat it is: CVE-2026-3870 is a medium-severity memory corruption vulnerability in Zyxel VMG4005-B50B firmware, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-3870 in the wild and no public exploit code.\n\nAffected product: Zyxel VMG4005-B50B firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-3870/ (Markdown: https://insights.sbomify.com/CVE-2026-3870/index.md)","id":"CVE-2026-3870","markdown":"https://insights.sbomify.com/CVE-2026-3870/index.md","name":"CVE-2026-3870","record":{"aliases":["GHSA-r75m-m2v9-89vv"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Zyxel router firmware","requires_auth":"none","summary":"An adjacent attacker can trigger a temporary denial-of-service condition in the UPnP function of Zyxel VMG4005-B50B routers via a buffer overflow.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Zyxel","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"A buffer overflow vulnerability in the UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Memory corruption in VMG4005-B50B firmware","id":"CVE-2026-3870","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Memory corruption in VMG4005-B50B firmware","id":"CVE-2026-3871"},"packages":[],"prev":{"headline":"Auth bypass in Modicon M580","id":"CVE-2026-3869"},"products":["VMG4005-B50B firmware"],"published":"2026-06-02","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-02","vendors":["Zyxel"]},"summary":"An adjacent attacker can trigger a temporary denial-of-service condition in the UPnP function of Zyxel VMG4005-B50B routers via a buffer overflow.","url":"https://insights.sbomify.com/CVE-2026-3870/"}