{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-118678 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-118678 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-118678 is a high-severity vulnerability in n8n-io n8n, published on 28 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-118678 and fix it if it is affected.\n\nWhat it is: CVE-2026-118678 is a high-severity vulnerability in n8n-io n8n, published on 28 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-118678 in the wild and no public exploit code.\n\nAffected product: n8n-io n8n. 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-2026-118678/ (Markdown: https://insights.sbomify.com/CVE-2026-118678/index.md)","id":"CVE-2026-118678","markdown":"https://insights.sbomify.com/CVE-2026-118678/index.md","name":"CVE-2026-118678","record":{"aliases":["GHSA-4v4v-jr32-r382","GHSA-fvv4-gmv9-xqf5"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.","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":"n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction","id":"CVE-2026-118678","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger","id":"CVE-2026-118679"},"packages":[],"prev":{"headline":"n8n before 2.41.4 and 2.42.1 Local Gateway Deep-Link Silent Re-pairing to Attacker Instance","id":"CVE-2026-118677"},"products":["n8n"],"published":"2026-10-28","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":"2026-10-29","vendors":["n8n-io"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-118678/"}