{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-93394 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-93394 is a medium-severity vulnerability in MongoDB Inc. C Driver, published on 17 Sep 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-2026-93394 and fix it if it is affected.\n\nWhat it is: CVE-2026-93394 is a medium-severity vulnerability in MongoDB Inc. C Driver, published on 17 Sep 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-2026-93394 in the wild and no public exploit code.\n\nAffected product: MongoDB Inc. 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-2026-93394/ (Markdown: https://insights.sbomify.com/CVE-2026-93394/index.md)","id":"CVE-2026-93394","markdown":"https://insights.sbomify.com/CVE-2026-93394/index.md","name":"CVE-2026-93394","record":{"aliases":["DEBIAN-CVE-2026-93394","GHSA-cxv8-vf43-xcw5","UBUNTU-CVE-2026-93394"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"MongoDB C Driver","requires_auth":"none","summary":"A man-in-the-middle attacker can bypass SCRAM nonce validation in the MongoDB C Driver to capture client proofs for offline password cracking.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[{"product":"c_driver","vendor":"mongodb"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-303","name":"Incorrect Implementation of Authentication Algorithm"}],"description":"A flaw in libmongoc's SCRAM authentication implementation caused the client to continue the authentication handshake and transmit the client proof even when a nonce mismatch was detected in the server's first message. An unauthorized party with a man-in-the-middle position could exploit this by injecting a crafted server-first-message containing a controlled salt and low iteration count, then capturing the resulting client proof to perform offline password cracking. This vulnerability is mitigated by TLS, which is standard in production deployments.","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":"libmongoc SCRAM client nonce-validation bypass","id":"CVE-2026-93394","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Integer Underflow → Heap Out-of-Bounds Read in `bson_new_from_buffer()","id":"CVE-2026-93395"},"packages":[],"prev":{"headline":"Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream","id":"CVE-2026-93393"},"products":["C Driver"],"published":"2026-09-17","related":[{"cvss_score":9.2,"headline":"Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream","id":"CVE-2026-93393","kev_date_added":null,"published":"2026-09-17"},{"cvss_score":8.6,"headline":"MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow","id":"CVE-2026-6691","kev_date_added":null,"published":"2026-05-06"},{"cvss_score":8.2,"headline":"Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client","id":"CVE-2026-84964","kev_date_added":null,"published":"2026-09-03"},{"cvss_score":7.3,"headline":"Accessing Untrusted Directory May Allow Local Privilege Escalation","id":"CVE-2024-7553","kev_date_added":null,"published":"2024-08-07"},{"cvss_score":6.9,"headline":"Integer Underflow → Heap Out-of-Bounds Read in `bson_new_from_buffer()","id":"CVE-2026-93395","kev_date_added":null,"published":"2026-09-17"},{"cvss_score":6.9,"headline":"Bulk write with options may read invalid memory","id":"CVE-2025-12119","kev_date_added":null,"published":"2025-11-18"}],"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":"2026-09-18","vendors":["MongoDB Inc."]},"summary":"A man-in-the-middle attacker can bypass SCRAM nonce validation in the MongoDB C Driver to capture client proofs for offline password cracking.","url":"https://insights.sbomify.com/CVE-2026-93394/"}