{"answers":{"affected":"2 open source packages ship an affected version, including msgpack.","exploited":"There is no known exploitation of CVE-2026-114613 in the wild and no public exploit code.","fix":"Upgrade msgpack to 1.2.3 or later.","what":"CVE-2026-114613 is a high-severity vulnerability in msgpack-python, published on 22 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-114613 and fix it if it is affected.\n\nWhat it is: CVE-2026-114613 is a high-severity vulnerability in msgpack-python, published on 22 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-114613 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- msgpack (PyPI): affected all versions; fixed in 1.2.3\n- msgpack (PyPI): affected all versions; fixed in 1.2.3\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-2026-114613/ (Markdown: https://insights.sbomify.com/CVE-2026-114613/index.md)","id":"CVE-2026-114613","markdown":"https://insights.sbomify.com/CVE-2026-114613/index.md","name":"CVE-2026-114613","record":{"aliases":["AZL-111044","DEBIAN-CVE-2026-114613","ECHO-3ddd-55c2-b818","GHSA-j586-36cw-2gc2","MINI-54jj-x2mq-hf2m","MINI-55vq-gf8w-crh2","MINI-fg2p-hwgm-r8cx"],"analysis":null,"analysis_generated_by":null,"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-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.3, the msgpack-python C extension (msgpack._cmsgpack) leaks a decoded map value when deserialization rejects a key with strict_map_key=True (the default). Repeated malformed inputs can cause unbounded process memory growth and denial of service in applications that deserialize attacker-controlled MessagePack data. Both unpackb() and the streaming Unpacker API are affected. The pure-Python fallback does not exhibit this leak in the reported tests. This issue is fixed in version 1.2.3.","ecosystems":["PyPI"],"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":"MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure","id":"CVE-2026-114613","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts","id":"CVE-2026-114614"},"packages":[{"ecosystem":"PyPI","fixed":["1.2.3"],"introduced":["0"],"last_affected":[],"package":"msgpack","purl":null,"source":"GHSA-j586-36cw-2gc2"},{"ecosystem":"PyPI","fixed":["1.2.3"],"introduced":["0"],"last_affected":[],"package":"msgpack","purl":"pkg:pypi/msgpack","source":"GHSA-j586-36cw-2gc2"}],"prev":{"headline":"LiteLLM: Privilege Escalation to Proxy Admin via Cross-Domain Reuse of the Salt Key","id":"CVE-2026-114612"},"products":["msgpack-python"],"published":"2026-10-22","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":"2026-10-23","vendors":["msgpack"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-114613/"}