{"answers":{"affected":"6 open source packages ship an affected version, including immutable. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-29063 in the wild and no public exploit code.","fix":"Upgrade immutable to a fixed version for your release line: 3.8.3, 4.3.8 or 5.1.5.","what":"CVE-2026-29063 is a high-severity vulnerability in immutable-js, published on 6 Mar 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-2026-29063 and fix it if it is affected.\n\nWhat it is: CVE-2026-29063 is a high-severity vulnerability in immutable-js, published on 6 Mar 2026. 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-2026-29063 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- immutable (npm): affected all versions; fixed in 3.8.3\n- immutable (npm): affected all versions; fixed in 3.8.3\n- immutable (npm): affected from 4.0.0-rc.1; fixed in 4.3.8\n- immutable (npm): affected from 4.0.0-rc.1; fixed in 4.3.8\n- immutable (npm): affected from 5.0.0; fixed in 5.1.5\n- immutable (npm): affected from 5.0.0; fixed in 5.1.5\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-2026-29063/ (Markdown: https://insights.sbomify.com/CVE-2026-29063/index.md)","id":"CVE-2026-29063","markdown":"https://insights.sbomify.com/CVE-2026-29063/index.md","name":"CVE-2026-29063","record":{"aliases":["CLEANSTART-2026-YP71485","CLEANSTART-2026-ZU95238","CLSA-2026-1777509598","CLSA-2026-1782954035","CLSA-2026-1783040459","DEBIAN-CVE-2026-29063","ECHO-f029-7bdc-7793","GHSA-wf6x-7x77-mvgw","MINI-2995-xw9v-m3gg","MINI-49gw-6qh8-9jh5","MINI-8rjw-6fq8-cx97","MINI-934g-xxrw-c4c4","MINI-9469-cgf2-7hhh","MINI-cx3j-rgp3-fpx6","ROOT-APP-NPM-CVE-2026-29063","UBUNTU-CVE-2026-29063"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript immutable library","requires_auth":"none","summary":"Prototype pollution in Immutable.js allows attackers to modify object prototypes, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"immutable","vendor":"immutable-js"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-915","name":"Improperly Controlled Modification of Dynamically-Determined Object Attributes"},{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.","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":"Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable","id":"CVE-2026-29063","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":6,"n_references":4,"next":{"headline":"Zarf: Symlink targets in archives are not validated against destination directory","id":"CVE-2026-29064"},"packages":[{"ecosystem":"npm","fixed":["3.8.3"],"introduced":["0"],"last_affected":[],"package":"immutable","purl":null,"source":"GHSA-wf6x-7x77-mvgw"},{"ecosystem":"npm","fixed":["3.8.3"],"introduced":["0"],"last_affected":[],"package":"immutable","purl":"pkg:npm/immutable","source":"GHSA-wf6x-7x77-mvgw"},{"ecosystem":"npm","fixed":["4.3.8"],"introduced":["4.0.0-rc.1"],"last_affected":[],"package":"immutable","purl":null,"source":"GHSA-wf6x-7x77-mvgw"},{"ecosystem":"npm","fixed":["4.3.8"],"introduced":["4.0.0-rc.1"],"last_affected":[],"package":"immutable","purl":"pkg:npm/immutable","source":"GHSA-wf6x-7x77-mvgw"},{"ecosystem":"npm","fixed":["5.1.5"],"introduced":["5.0.0"],"last_affected":[],"package":"immutable","purl":null,"source":"GHSA-wf6x-7x77-mvgw"},{"ecosystem":"npm","fixed":["5.1.5"],"introduced":["5.0.0"],"last_affected":[],"package":"immutable","purl":"pkg:npm/immutable","source":"GHSA-wf6x-7x77-mvgw"}],"prev":{"headline":"jackson-core: Nesting Depth Constraint Bypass in `UTF8DataInputJsonParser` potentially allowing Resource Exhaustion","id":"CVE-2026-29062"},"products":["immutable-js"],"published":"2026-03-06","related":[{"cvss_score":8.7,"headline":"Immutable.js `List` 32-bit trie overflow → unrecoverable DoS","id":"CVE-2026-59879","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":8.7,"headline":"Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set","id":"CVE-2026-59880","kev_date_added":null,"published":"2026-07-08"}],"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-10","vendors":["immutable-js"]},"summary":"Prototype pollution in Immutable.js allows attackers to modify object prototypes, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-29063/"}