{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56121 exists.","fix":"No fix has been published for CVE-2026-56121 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-56121 is a critical unsafe deserialization vulnerability in feast-dev feast, published on 24 Jun 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-2026-56121 and fix it if it is affected.\n\nWhat it is: CVE-2026-56121 is a critical unsafe deserialization vulnerability in feast-dev feast, published on 24 Jun 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-2026-56121 exists.\n\nAffected product: feast-dev feast. 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-2026-56121/ (Markdown: https://insights.sbomify.com/CVE-2026-56121/index.md)","id":"CVE-2026-56121","markdown":"https://insights.sbomify.com/CVE-2026-56121/index.md","name":"CVE-2026-56121","record":{"aliases":["GHSA-q63x-9pfm-mjx4"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Feast feature store","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary code on Feast registry servers via unsafe deserialization in gRPC requests.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"Feast before 0.63.0 contains an unsafe deserialization vulnerability that allows unauthenticated or unauthorized attackers to achieve remote code execution by sending a crafted gRPC request to the registry server. The user_defined_function.body field of an OnDemandFeatureView spec is decoded from base64 and passed to dill.loads() before any authorization check is performed, enabling attackers to embed a malicious serialized Python object with an arbitrary __reduce__ method to execute OS commands as the feast service account.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-06-30","github_poc":3,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-23T09:49:21Z","kind":"github_poc","ref":"https://github.com/0xdak/CVE-2026-56121_exploit","stars":1,"title":null},{"date":"2026-06-30T08:27:06Z","kind":"github_poc","ref":"https://github.com/BiiTts/CVE-2026-56121-Feast-Unauth-RCE","stars":0,"title":"CVE-2026-56121 — Feast \u003c0.63.0 unauthenticated RCE via gRPC registry dill.loads of OnDemandFeatureView UDF (pre-auth). Lab + PoC, verified e2e."},{"date":"2026-08-30T20:51:53Z","kind":"github_poc","ref":"https://github.com/joaovicdev/EXPLOIT-CVE-2026-56121","stars":0,"title":null}],"tier":"weaponised"},"has_fix":false,"headline":"Feast \u003c 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization","id":"CVE-2026-56121","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Winstone Servlet Engine 0.9.10 Path Traversal via HTTP Request Paths","id":"CVE-2026-56122"},"packages":[],"prev":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2026-56119"},"products":["feast"],"published":"2026-06-24","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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-28","vendors":["feast-dev"]},"summary":"Unauthenticated attackers can execute arbitrary code on Feast registry servers via unsafe deserialization in gRPC requests.","url":"https://insights.sbomify.com/CVE-2026-56121/"}