{"answers":{"affected":"2 open source packages ship an affected version, including json-schema. It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-3918 in the wild and no public exploit code.","fix":"Upgrade json-schema to 0.4.0 or later.","what":"CVE-2021-3918 is a critical vulnerability in Debian Debian Linux, published on 13 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-3918 and fix it if it is affected.\n\nWhat it is: CVE-2021-3918 is a critical vulnerability in Debian Debian Linux, published on 13 Nov 2021. 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-2021-3918 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- json-schema (npm): affected all versions; fixed in 0.4.0\n- json-schema (npm): affected all versions; fixed in 0.4.0\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-2021-3918/ (Markdown: https://insights.sbomify.com/CVE-2021-3918/index.md)","id":"CVE-2021-3918","markdown":"https://insights.sbomify.com/CVE-2021-3918/index.md","name":"CVE-2021-3918","record":{"aliases":["CLSA-2026-1781052738","DEBIAN-CVE-2021-3918","DLA-3228-1","GHSA-896r-f27r-55mw","MGASA-2022-0463","MINI-54pr-jvvg-57w5","ROOT-APP-NPM-CVE-2021-3918","UBUNTU-CVE-2021-3918","USN-6103-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript JSON schema library","requires_auth":"none","summary":"Prototype pollution in the json-schema library allows attackers to modify object prototypes, potentially leading to code execution or security bypasses.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntrdev","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"json-schema","vendor":"json-schema_project"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Prototype Pollution in kriszyp/json-schema","id":"CVE-2021-3918","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"debian:debian_linux","products":["debian:debian_linux"],"type":"other","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Privilege escalation in OMEN Gaming Hub and HP Command Center","id":"CVE-2021-3919"},"packages":[{"ecosystem":"npm","fixed":["0.4.0"],"introduced":["0"],"last_affected":[],"package":"json-schema","purl":null,"source":"GHSA-896r-f27r-55mw"},{"ecosystem":"npm","fixed":["0.4.0"],"introduced":["0"],"last_affected":[],"package":"json-schema","purl":"pkg:npm/json-schema","source":"GHSA-896r-f27r-55mw"}],"prev":{"headline":"coreos-installer \u003c 0.10.0 writes world-readable Ignition config to installed system","id":"CVE-2021-3917"},"products":["kriszyp/json-schema"],"published":"2021-11-13","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2025-01-17","vendors":["kriszyp"]},"summary":"Prototype pollution in the json-schema library allows attackers to modify object prototypes, potentially leading to code execution or security bypasses.","url":"https://insights.sbomify.com/CVE-2021-3918/"}