{"answers":{"affected":"2 open source packages ship an affected version, including msgpack5.","exploited":"There is no known exploitation of CVE-2026-107300 in the wild and no public exploit code.","fix":"Upgrade msgpack5 to 6.1.0 or later.","what":"CVE-2026-107300 is a high-severity denial of service 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-2026-107300 and fix it if it is affected.\n\nWhat it is: CVE-2026-107300 is a high-severity denial of service 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-2026-107300 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-2026-107300/ (Markdown: https://insights.sbomify.com/CVE-2026-107300/index.md)","id":"CVE-2026-107300","markdown":"https://insights.sbomify.com/CVE-2026-107300/index.md","name":"CVE-2026-107300","record":{"aliases":["AZL-106851","GHSA-5x5g-h9x8-2fh9"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js msgpack library","requires_auth":"none","summary":"A remote attacker can cause a denial of service by sending a chunk with many small values, exhausting the call stack in the msgpack5 streaming decoder.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-674","name":"Uncontrolled Recursion"}],"description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder recursively invokes itself for each complete MessagePack value remaining in a chunk. A remote peer can send one chunk containing many small valid values, causing recursion proportional to the value count, exhausting the JavaScript call stack, and interrupting the process or stream. 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: Many buffered values can exhaust the streaming decoder stack","id":"CVE-2026-107300","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"msgpack5: Partial options disable prototype protection","id":"CVE-2026-107301"},"packages":[{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":null,"source":"GHSA-5x5g-h9x8-2fh9"},{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":"pkg:npm/msgpack5","source":"GHSA-5x5g-h9x8-2fh9"}],"prev":{"headline":"msgpack5: Reserved byte can cause unbounded stream buffering","id":"CVE-2026-107299"},"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["mcollina"]},"summary":"A remote attacker can cause a denial of service by sending a chunk with many small values, exhausting the call stack in the msgpack5 streaming decoder.","url":"https://insights.sbomify.com/CVE-2026-107300/"}