{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-40016 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-40016 is a medium-severity denial of service vulnerability in Dovecot Dovecot, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-40016 and fix it if it is affected.\n\nWhat it is: CVE-2026-40016 is a medium-severity denial of service vulnerability in Dovecot Dovecot, published on 12 May 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-2026-40016 in the wild and no public exploit code.\n\nAffected product: Dovecot Dovecot. 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-2026-40016/ (Markdown: https://insights.sbomify.com/CVE-2026-40016/index.md)","id":"CVE-2026-40016","markdown":"https://insights.sbomify.com/CVE-2026-40016/index.md","name":"CVE-2026-40016","record":{"aliases":["ALPINE-CVE-2026-40016","AZL-86805","DEBIAN-CVE-2026-40016","GHSA-m97m-74mq-mqc6","SUSE-SU-2026:4271-1","UBUNTU-CVE-2026-40016"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Dovecot Sieve server","requires_auth":"low_privilege","summary":"Attackers can bypass Sieve CPU time limits via malicious scripts, degrading server performance and causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"OX","cpe":[{"product":"dovecot","vendor":"dovecot"},{"product":"dovecot","vendor":"open-xchange"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.","ecosystems":["SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5"],"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":"Denial of service in OX Dovecot Pro","id":"CVE-2026-40016","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"dovecot:dovecot","products":["dovecot:dovecot"],"type":"denial_of_service","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"Denial of service in OX Dovecot CE","id":"CVE-2026-40017"},"packages":[{"ecosystem":"SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","fixed":["2.2.31-19.43.1"],"introduced":["0"],"last_affected":[],"package":"dovecot22","purl":"pkg:rpm/suse/dovecot22\u0026distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5","source":"SUSE-SU-2026:4271-1"}],"prev":{"headline":"Denial of service in OX Dovecot CE","id":"CVE-2026-40015"},"products":["OX Dovecot Pro"],"published":"2026-05-12","related":[{"cvss_score":7.7,"headline":"Auth bypass in OX Dovecot Pro","id":"CVE-2026-24031","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":7.5,"headline":"Denial of service in OX Dovecot Pro","id":"CVE-2025-59032","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":7.5,"headline":"Denial of service in OX Dovecot Pro","id":"CVE-2026-27858","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":7.5,"headline":"Path traversal in n/a","id":"CVE-2021-29157","kev_date_added":null,"published":"2021-06-28"},{"cvss_score":7.5,"headline":"Null dereference in n/a","id":"CVE-2020-10957","kev_date_added":null,"published":"2020-05-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2020-7046","kev_date_added":null,"published":"2020-02-12"},{"cvss_score":7.5,"headline":"Null dereference in n/a","id":"CVE-2019-11494","kev_date_added":null,"published":"2019-05-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"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":"2026-05-12","vendors":["Open-Xchange GmbH"]},"summary":"Attackers can bypass Sieve CPU time limits via malicious scripts, degrading server performance and causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-40016/"}