{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-106434 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-106434 is a medium-severity vulnerability in MongoDB libmongocrypt, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-106434 and fix it if it is affected.\n\nWhat it is: CVE-2026-106434 is a medium-severity vulnerability in MongoDB libmongocrypt, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-106434 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-2026-106434/ (Markdown: https://insights.sbomify.com/CVE-2026-106434/index.md)","id":"CVE-2026-106434","markdown":"https://insights.sbomify.com/CVE-2026-106434/index.md","name":"CVE-2026-106434","record":{"aliases":["DEBIAN-CVE-2026-106434","UBUNTU-CVE-2026-106434"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","other"],"network_reachable":"yes","non_default_config":false,"product_category":"MongoDB encryption library","requires_auth":"low_privilege","summary":"Attackers can inject unrecognized payloads into encrypted fields, causing applications to process them as plaintext, potentially leading to data exposure or logic errors.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mongodb","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-354","name":"Improper Validation of Integrity Check Value"}],"description":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.","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":"Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt","id":"CVE-2026-106434","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver","id":"CVE-2026-106435"},"packages":[],"prev":{"headline":"Heap corruption via duplicate masterKey fields in MongoDB libmongocrypt","id":"CVE-2026-106433"},"products":["libmongocrypt"],"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":"Attackers can inject unrecognized payloads into encrypted fields, causing applications to process them as plaintext, potentially leading to data exposure or logic errors.","url":"https://insights.sbomify.com/CVE-2026-106434/"}