{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4861 exists.","fix":"No fix has been published for CVE-2026-4861 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-4861 is a high-severity memory corruption vulnerability in Wavlink WL-NU516U1, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-4861 and fix it if it is affected.\n\nWhat it is: CVE-2026-4861 is a high-severity memory corruption vulnerability in Wavlink WL-NU516U1, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4861 exists.\n\nAffected product: Wavlink WL-NU516U1. 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-2026-4861/ (Markdown: https://insights.sbomify.com/CVE-2026-4861/index.md)","id":"CVE-2026-4861","markdown":"https://insights.sbomify.com/CVE-2026-4861/index.md","name":"CVE-2026-4861","record":{"aliases":["GHSA-f5jv-m3j9-f42p"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Wavlink NAS device","requires_auth":"low_privilege","summary":"Remote attackers can trigger a stack-based buffer overflow in the Wavlink WL-NU516U1 NAS via the nas.cgi script, potentially executing arbitrary code.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[{"product":"wl-nu516u1_firmware","vendor":"wavlink"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-121","name":"Stack-based Buffer Overflow"},{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"description":"A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-07-27","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-27T01:41:09Z","kind":"github_poc","ref":"https://github.com/HORKimhab/CVE-2026-4861","stars":0,"title":"CVE-2026-4861 - Draft or Todo"}],"tier":"weaponised"},"has_fix":null,"headline":"Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow","id":"CVE-2026-4861","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"UTT HiPER 1250GW Parameter formConfigDnsFilterGlobal strcpy buffer overflow","id":"CVE-2026-4862"},"packages":[],"prev":{"headline":"648540858 wvp-GB28181-pro API Endpoint RedisTemplateConfig.java GenericFastJsonRedisSerializer deserialization","id":"CVE-2026-4860"},"products":["WL-NU516U1"],"published":"2026-03-26","related":[{"cvss_score":9.3,"headline":"Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write","id":"CVE-2026-3703","kev_date_added":null,"published":"2026-03-08"},{"cvss_score":8.6,"headline":"Wavlink WL-NU516U1 OTA Online Upgrade adm.cgi sub_405AF4 command injection","id":"CVE-2026-3612","kev_date_added":null,"published":"2026-03-06"},{"cvss_score":8.6,"headline":"Wavlink WL-NU516U1 login.cgi sub_401A0C stack-based overflow","id":"CVE-2026-3613","kev_date_added":null,"published":"2026-03-06"},{"cvss_score":8.6,"headline":"Wavlink WL-NU516U1 firewall.cgi singlePortForwardDelete command injection","id":"CVE-2026-2615","kev_date_added":null,"published":"2026-02-17"},{"cvss_score":8.6,"headline":"Wavlink WL-NU516U1 nas.cgi sub_401218 stack-based overflow","id":"CVE-2026-2567","kev_date_added":null,"published":"2026-02-16"},{"cvss_score":7.5,"headline":"Wavlink WL-NU516U1 adm.cgi sub_40785C stack-based overflow","id":"CVE-2026-2565","kev_date_added":null,"published":"2026-02-16"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-03-26","vendors":["Wavlink"]},"summary":"Remote attackers can trigger a stack-based buffer overflow in the Wavlink WL-NU516U1 NAS via the nas.cgi script, potentially executing arbitrary code.","url":"https://insights.sbomify.com/CVE-2026-4861/"}