{"answers":{"affected":"2 open source packages ship an affected version, including msgpack5.","exploited":"There is no known exploitation of CVE-2026-107301 in the wild and no public exploit code.","fix":"Upgrade msgpack5 to 6.1.0 or later.","what":"CVE-2026-107301 is a medium-severity unsafe deserialization vulnerability in mcollina msgpack5, published on 8 Oct 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-2026-107301 and fix it if it is affected.\n\nWhat it is: CVE-2026-107301 is a medium-severity unsafe deserialization vulnerability in mcollina msgpack5, published on 8 Oct 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-2026-107301 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- msgpack5 (npm): affected all versions; fixed in 6.1.0\n- msgpack5 (npm): affected all versions; fixed in 6.1.0\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-2026-107301/ (Markdown: https://insights.sbomify.com/CVE-2026-107301/index.md)","id":"CVE-2026-107301","markdown":"https://insights.sbomify.com/CVE-2026-107301/index.md","name":"CVE-2026-107301","record":{"aliases":["AZL-106857","GHSA-8hq7-ggx2-cc6m"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":true,"product_category":"Node.js msgpack library","requires_auth":"none","summary":"Attackers can exploit prototype pollution in msgpack5 when using partial options, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: 'error' protection. A decoded map containing a __proto__ key can then replace the decoded object's prototype, potentially changing inherited properties or downstream behavior, although Object.prototype is not modified globally. This issue is fixed in version 6.1.0.","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":"msgpack5: Partial options disable prototype protection","id":"CVE-2026-107301","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"msgpack5: Truncated map32 headers throw an unexpected error","id":"CVE-2026-107302"},"packages":[{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":null,"source":"GHSA-8hq7-ggx2-cc6m"},{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":"pkg:npm/msgpack5","source":"GHSA-8hq7-ggx2-cc6m"}],"prev":{"headline":"msgpack5: Many buffered values can exhaust the streaming decoder stack","id":"CVE-2026-107300"},"products":["msgpack5"],"published":"2026-10-08","related":[],"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":"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":"2026-10-14","vendors":["mcollina"]},"summary":"Attackers can exploit prototype pollution in msgpack5 when using partial options, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-107301/"}