{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-106431 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-106431 is a medium-severity memory corruption vulnerability in MongoDB C Driver, published on 8 Oct 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-2026-106431 and fix it if it is affected.\n\nWhat it is: CVE-2026-106431 is a medium-severity memory corruption vulnerability in MongoDB C Driver, published on 8 Oct 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-2026-106431 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-2026-106431/ (Markdown: https://insights.sbomify.com/CVE-2026-106431/index.md)","id":"CVE-2026-106431","markdown":"https://insights.sbomify.com/CVE-2026-106431/index.md","name":"CVE-2026-106431","record":{"aliases":["DEBIAN-CVE-2026-106431","UBUNTU-CVE-2026-106431"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"MongoDB C Driver","requires_auth":"none","summary":"An off-by-one error in the MongoDB C Driver allows heap corruption or crashes when specific document sizes are serialized via the bulk-writer API.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[],"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:L/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"An off-by-one error in the BSON bulk document writer in the MongoDB C Driver can write one zero byte immediately past a heap allocation when a document ends at a specific buffer boundary. An actor who can influence the size of documents serialized by an embedding application can corrupt adjacent process memory or terminate the process. Reaching this issue requires the application to use the BSON bulk-writer API and produce a precise cumulative document size.","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":"One-byte heap buffer overflow in BSON bulk document writer in MongoDB C Driver","id":"CVE-2026-106431","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Heap buffer overflow via 32-bit string-length truncation in MongoDB PHP Driver","id":"CVE-2026-106432"},"packages":[],"prev":{"headline":"Query and rename target confusion via embedded NUL truncation in MongoDB C++ Driver","id":"CVE-2026-106430"},"products":["C Driver"],"published":"2026-10-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-10-08","vendors":["MongoDB"]},"summary":"An off-by-one error in the MongoDB C Driver allows heap corruption or crashes when specific document sizes are serialized via the bulk-writer API.","url":"https://insights.sbomify.com/CVE-2026-106431/"}