{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-71256 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-71256 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-71256 is a critical memory corruption vulnerability in debevv nanoMODBUS, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-71256 and fix it if it is affected.\n\nWhat it is: CVE-2026-71256 is a critical memory corruption vulnerability in debevv nanoMODBUS, published on 5 Aug 2026. 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-2026-71256 in the wild and no public exploit code.\n\nAffected product: debevv nanoMODBUS. 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-2026-71256/ (Markdown: https://insights.sbomify.com/CVE-2026-71256/index.md)","id":"CVE-2026-71256","markdown":"https://insights.sbomify.com/CVE-2026-71256/index.md","name":"CVE-2026-71256","record":{"aliases":["GHSA-vq4c-5vwv-g86v"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Modbus library","requires_auth":"none","summary":"A remote attacker can trigger a wild-pointer write via an out-of-bounds read in the nanoMODBUS library, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"TuranSec","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"nanoMODBUS through v1.23.0 contains an out-of-bounds stack read leading to a wild-pointer write in nmbs_read_device_identification_basic / recv_read_device_identification_res in nanomodbus.c. A fixed 3-element stack array order[3] = {0,1,2} maps object IDs to buffer indices. The server-supplied object_id field (0-255, read directly from the wire) is used without any bounds check as buf_index = order[object_id].","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"nanoMODBUS Client-Side Out-of-Bounds Read Leading to Wild-Pointer Write via object_id","id":"CVE-2026-71256","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Apache Wicket: Configured file upload limits are not enforced when the multipart request has already been parsed","id":"CVE-2026-71257"},"packages":[],"prev":{"headline":"nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()","id":"CVE-2026-71255"},"products":["nanoMODBUS"],"published":"2026-08-05","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":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-10","vendors":["debevv"]},"summary":"A remote attacker can trigger a wild-pointer write via an out-of-bounds read in the nanoMODBUS library, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2026-71256/"}