{"answers":{"affected":"1 open source package ship an affected version, including mongodb. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-18691 in the wild and no public exploit code.","fix":"Upgrade mongodb to a fixed version for your release line: 7.0.40, 8.0.29, 8.3.8 or 9.0.2.","what":"CVE-2026-18691 is a critical authentication bypass vulnerability in Mongodb Mongodb, published on 11 Aug 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-2026-18691 and fix it if it is affected.\n\nWhat it is: CVE-2026-18691 is a critical authentication bypass vulnerability in Mongodb Mongodb, published on 11 Aug 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-2026-18691 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mongodb (Bitnami): affected from 7.0.0; fixed in 7.0.40, 8.0.29, 8.3.8, 9.0.2\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-2026-18691/ (Markdown: https://insights.sbomify.com/CVE-2026-18691/index.md)","id":"CVE-2026-18691","markdown":"https://insights.sbomify.com/CVE-2026-18691/index.md","name":"CVE-2026-18691","record":{"aliases":["BIT-mongodb-2026-18691","GHSA-jx4v-jf9c-3rh7","MINI-9rvh-8jjx-56rv","MINI-hq2m-3h6f-vw76","MINI-jjf8-v5j5-pvjh","MINI-r99w-g6f3-wmph","UBUNTU-CVE-2026-18691"],"analysis":{"component_type":"database","fix_type":"patch","impacts":["privilege_escalation","data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"MongoDB Server","requires_auth":"none","summary":"An attacker with network access can force weaker authentication in MongoDB clusters to steal internal credentials and gain superuser access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[{"product":"mongodb","vendor":"mongodb"}],"cvss":{"score":9,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-757","name":"Selection of Less-Secure Algorithm During Negotiation"}],"description":"An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.","ecosystems":["Bitnami"],"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":"Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure","id":"CVE-2026-18691","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"mongodb:mongodb","products":["mongodb:mongodb"],"type":"auth_bypass","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"Use-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potential Remote Code Execution","id":"CVE-2026-18692"},"packages":[{"ecosystem":"Bitnami","fixed":["7.0.40","8.0.29","8.3.8","9.0.2"],"introduced":["7.0.0","8.0.0","8.2.0","9.0.0"],"last_affected":[],"package":"mongodb","purl":"pkg:bitnami/mongodb","source":"BIT-mongodb-2026-18691"}],"prev":{"headline":"Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections","id":"CVE-2026-18690"},"products":["MongoDB Server"],"published":"2026-08-11","related":[{"cvss_score":8.7,"headline":"MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency","id":"CVE-2025-14847","kev_date_added":"2025-12-29","published":"2025-12-19"},{"cvss_score":9.2,"headline":"Auth bypass in MongoDB Server","id":"CVE-2026-82067","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":9.2,"headline":"MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption","id":"CVE-2026-13072","kev_date_added":null,"published":"2026-07-22"},{"cvss_score":9.1,"headline":"Denial of service in n/a","id":"CVE-2017-15535","kev_date_added":null,"published":"2017-11-01"},{"cvss_score":8.8,"headline":"MongoDB Server may allow successful untrusted connection","id":"CVE-2024-1351","kev_date_added":null,"published":"2024-03-07"},{"cvss_score":8.7,"headline":"Denial of service in MongoDB Server","id":"CVE-2026-82064","kev_date_added":null,"published":"2026-09-08"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":"total"},"state":"PUBLISHED","updated":"2026-08-11","vendors":["MongoDB"]},"summary":"An attacker with network access can force weaker authentication in MongoDB clusters to steal internal credentials and gain superuser access.","url":"https://insights.sbomify.com/CVE-2026-18691/"}