{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-81523 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-81523 is a low-severity vulnerability in MongoDB libmongocrypt, published on 27 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-2026-81523 and fix it if it is affected.\n\nWhat it is: CVE-2026-81523 is a low-severity vulnerability in MongoDB libmongocrypt, published on 27 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-2026-81523 in the wild and no public exploit code.\n\nAffected product: MongoDB libmongocrypt. 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-2026-81523/ (Markdown: https://insights.sbomify.com/CVE-2026-81523/index.md)","id":"CVE-2026-81523","markdown":"https://insights.sbomify.com/CVE-2026-81523/index.md","name":"CVE-2026-81523","record":{"aliases":["DEBIAN-CVE-2026-81523","UBUNTU-CVE-2026-81523"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"MongoDB encryption library","requires_auth":"low_privilege","summary":"Attackers can manipulate database identifiers to cause incorrect schema selection, leading to limited data disclosure or modification in applications using libmongocrypt.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[{"product":"libmongocrypt","vendor":"mongodb"}],"cvss":{"score":2,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"description":"A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.","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":"Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt","id":"CVE-2026-81523","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver","id":"CVE-2026-81524"},"packages":[],"prev":{"headline":"Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver","id":"CVE-2026-81522"},"products":["libmongocrypt"],"published":"2026-08-27","related":[{"cvss_score":8.7,"headline":"Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt","id":"CVE-2026-106433","kev_date_added":null,"published":"2026-10-08"},{"cvss_score":7.1,"headline":"Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption path","id":"CVE-2026-84971","kev_date_added":null,"published":"2026-09-03"},{"cvss_score":5.7,"headline":"Authenticated KMS request forgery via CRLF injection in GCP key identifier strings","id":"CVE-2026-84962","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":"2026-08-28","vendors":["MongoDB"]},"summary":"Attackers can manipulate database identifiers to cause incorrect schema selection, leading to limited data disclosure or modification in applications using libmongocrypt.","url":"https://insights.sbomify.com/CVE-2026-81523/"}