{"answers":{"affected":"2 open source packages ship an affected version, including msgpack5.","exploited":"There is no known exploitation of CVE-2026-107296 in the wild and no public exploit code.","fix":"Upgrade msgpack5 to 6.1.0 or later.","what":"CVE-2026-107296 is a low-severity 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-2026-107296 and fix it if it is affected.\n\nWhat it is: CVE-2026-107296 is a low-severity 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-2026-107296 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-2026-107296/ (Markdown: https://insights.sbomify.com/CVE-2026-107296/index.md)","id":"CVE-2026-107296","markdown":"https://insights.sbomify.com/CVE-2026-107296/index.md","name":"CVE-2026-107296","record":{"aliases":["AZL-106854","GHSA-qw35-55vc-rhgj"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js msgpack library","requires_auth":"none","summary":"Decoding negative int64 values in msgpack5 mutates the input buffer, causing silent data corruption for applications reusing the buffer.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-471","name":"Modification of Assumed-Immutable Data (MAID)"}],"description":"msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. 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: Decoding negative int64 values mutates the input buffer","id":"CVE-2026-107296","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"other","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"msgpack5: Quadratic parsing in the streaming decoder","id":"CVE-2026-107297"},"packages":[{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":null,"source":"GHSA-qw35-55vc-rhgj"},{"ecosystem":"npm","fixed":["6.1.0"],"introduced":["0"],"last_affected":[],"package":"msgpack5","purl":"pkg:npm/msgpack5","source":"GHSA-qw35-55vc-rhgj"}],"prev":{"headline":"Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): a website visited by the developer can trigger agent runs and server-side tool execution on the local chat endpoint","id":"CVE-2026-107295"},"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":"Decoding negative int64 values in msgpack5 mutates the input buffer, causing silent data corruption for applications reusing the buffer.","url":"https://insights.sbomify.com/CVE-2026-107296/"}