{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42854 exists.","fix":"No fix has been published for CVE-2026-42854 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-42854 is a critical memory corruption vulnerability in espressif arduino-esp32, published on 12 May 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-2026-42854 and fix it if it is affected.\n\nWhat it is: CVE-2026-42854 is a critical memory corruption vulnerability in espressif arduino-esp32, published on 12 May 2026. 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-2026-42854 exists.\n\nAffected product: espressif arduino-esp32. 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-2026-42854/ (Markdown: https://insights.sbomify.com/CVE-2026-42854/index.md)","id":"CVE-2026-42854","markdown":"https://insights.sbomify.com/CVE-2026-42854/index.md","name":"CVE-2026-42854","record":{"aliases":["GHSA-8cmm-3887-r32j"],"analysis":{"component_type":"iot_embedded","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"ESP32 Arduino core","requires_auth":"none","summary":"Remote attackers can trigger a stack buffer overflow in the WebServer multipart parser, potentially causing crashes or executing arbitrary code on ESP32 devices.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"arduino-esp32","vendor":"espressif"}],"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-121","name":"Stack-based Buffer Overflow"}],"description":"arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, the WebServer multipart form parser in arduino-esp32 allocates a Variable Length Array (VLA) on the stack whose size is derived from an attacker-controlled HTTP header field (Content-Type: multipart/form-data; boundary=...) without enforcing any length limit. Sending a boundary string longer than ~8000 characters overflows the 8192-byte task stack of the loopTask, causing a crash and potential remote code execution. This vulnerability is fixed in 3.3.8.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"arduino-esp32: Stack buffer overflow in WebServer multipart boundary parsing leads to remote crash potential RCE","id":"CVE-2026-42854","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":"arduino-esp32: Digest authentication URI mismatch bypass in WebServer allows cross-resource replay attack","id":"CVE-2026-42855"},"packages":[],"prev":{"headline":"@apostrophecms/cli: Command Injection in apos create via Unsanitized Password Input","id":"CVE-2026-42853"},"products":["arduino-esp32"],"published":"2026-05-12","related":[{"cvss_score":8.8,"headline":"Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption","id":"CVE-2026-41429","kev_date_added":null,"published":"2026-04-24"},{"cvss_score":7.5,"headline":"arduino-esp32: Digest authentication URI mismatch bypass in WebServer allows cross-resource replay attack","id":"CVE-2026-42855","kev_date_added":null,"published":"2026-05-12"},{"cvss_score":6.5,"headline":"Denial of service in n/a","id":"CVE-2019-12586","kev_date_added":null,"published":"2019-09-04"}],"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)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-13","vendors":["espressif"]},"summary":"Remote attackers can trigger a stack buffer overflow in the WebServer multipart parser, potentially causing crashes or executing arbitrary code on ESP32 devices.","url":"https://insights.sbomify.com/CVE-2026-42854/"}