{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-84966 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-84966 is a medium-severity vulnerability in MongoDB C++ Driver, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-84966 and fix it if it is affected.\n\nWhat it is: CVE-2026-84966 is a medium-severity vulnerability in MongoDB C++ Driver, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-84966 in the wild and no public exploit code.\n\nAffected product: MongoDB C++ Driver. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-84966/ (Markdown: https://insights.sbomify.com/CVE-2026-84966/index.md)","id":"CVE-2026-84966","markdown":"https://insights.sbomify.com/CVE-2026-84966/index.md","name":"CVE-2026-84966","record":{"aliases":["DEBIAN-CVE-2026-84966","UBUNTU-CVE-2026-84966"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"MongoDB C++ Driver","requires_auth":"none","summary":"An integer overflow in the MongoDB C++ Driver allows attackers to cause a denial of service via oversized field names.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[{"product":"c\\+\\+_driver","vendor":"mongodb"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-681","name":"Incorrect Conversion between Numeric Types"}],"description":"An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cause a length value to be interpreted incorrectly. When an application supplies an extremely large, non-terminated field name to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form.","ecosystems":[],"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":"BSON element injection via NUL-embedded document keys in builder append","id":"CVE-2026-84966","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Arbitrary command execution via shell-expanded connection string in Launch MongoDB Shell terminal","id":"CVE-2026-84967"},"packages":[],"prev":{"headline":"Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds","id":"CVE-2026-84965"},"products":["C++ Driver"],"published":"2026-09-03","related":[{"cvss_score":8.6,"headline":"Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver","id":"CVE-2026-81522","kev_date_added":null,"published":"2026-08-27"},{"cvss_score":6.1,"headline":"GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C++ Driver","id":"CVE-2026-88034","kev_date_added":null,"published":"2026-09-10"},{"cvss_score":5.9,"headline":"Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser","id":"CVE-2026-84970","kev_date_added":null,"published":"2026-09-03"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-03","vendors":["MongoDB"]},"summary":"An integer overflow in the MongoDB C++ Driver allows attackers to cause a denial of service via oversized field names.","url":"https://insights.sbomify.com/CVE-2026-84966/"}