{"answers":{"affected":"2 open source packages ship an affected version, including immer. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23436 in the wild and no public exploit code.","fix":"Upgrade immer to 9.0.6 or later.","what":"CVE-2021-23436 is a medium-severity vulnerability in immer, published on 1 Sep 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-2021-23436 and fix it if it is affected.\n\nWhat it is: CVE-2021-23436 is a medium-severity vulnerability in immer, published on 1 Sep 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-2021-23436 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- immer (npm): affected from 7.0.0; fixed in 9.0.6\n- immer (npm): affected from 7.0.0; fixed in 9.0.6\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-2021-23436/ (Markdown: https://insights.sbomify.com/CVE-2021-23436/index.md)","id":"CVE-2021-23436","markdown":"https://insights.sbomify.com/CVE-2021-23436/index.md","name":"CVE-2021-23436","record":{"aliases":["GHSA-33f9-j839-rf8h","ROOT-APP-NPM-CVE-2021-23436"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript state library","requires_auth":"none","summary":"Prototype pollution in immer allows attackers to bypass previous security fixes via array-based path parameters, potentially leading to code execution.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"immer","vendor":"immer_project"}],"cvss":{"score":5.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-843","name":"Access of Resource Using Incompatible Type"}],"description":"This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === \"__proto__\" || p === \"constructor\") in applyPatches_ returns false if p is ['__proto__'] (or ['constructor']). The === operator (strict equality operator) returns false if the operands have different type.","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","id":"CVE-2021-23436","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Regular Expression Denial of Service (ReDoS)","id":"CVE-2021-23437"},"packages":[{"ecosystem":"npm","fixed":["9.0.6"],"introduced":["7.0.0"],"last_affected":[],"package":"immer","purl":null,"source":"GHSA-33f9-j839-rf8h"},{"ecosystem":"npm","fixed":["9.0.6"],"introduced":["7.0.0"],"last_affected":[],"package":"immer","purl":"pkg:npm/immer","source":"GHSA-33f9-j839-rf8h"}],"prev":{"headline":"Open Redirect","id":"CVE-2021-23435"},"products":["immer"],"published":"2021-09-01","related":[{"cvss_score":7.5,"headline":"Prototype Pollution in immerjs/immer","id":"CVE-2021-3757","kev_date_added":null,"published":"2021-09-02"},{"cvss_score":7.5,"headline":"Prototype Pollution","id":"CVE-2020-28477","kev_date_added":null,"published":"2021-01-19"}],"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":"2024-09-16","vendors":["n/a"]},"summary":"Prototype pollution in immer allows attackers to bypass previous security fixes via array-based path parameters, potentially leading to code execution.","url":"https://insights.sbomify.com/CVE-2021-23436/"}