{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-40020 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-40020 is a low-severity vulnerability in Dovecot Dovecot, published on 12 May 2026."},"fix_prompt":"Check this codebase for CVE-2026-40020 and fix it if it is affected.\n\nWhat it is: CVE-2026-40020 is a low-severity vulnerability in Dovecot Dovecot, published on 12 May 2026. \nExploitation: There is no known exploitation of CVE-2026-40020 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-2026-40020/ (Markdown: https://insights.sbomify.com/CVE-2026-40020/index.md)","id":"CVE-2026-40020","markdown":"https://insights.sbomify.com/CVE-2026-40020/index.md","name":"CVE-2026-40020","record":{"aliases":["ALPINE-CVE-2026-40020","AZL-86808","DEBIAN-CVE-2026-40020","GHSA-h6rp-9mjf-6x88","UBUNTU-CVE-2026-40020"],"analysis":null,"analysis_generated_by":null,"assigner":"OX","cpe":[{"product":"dovecot","vendor":"dovecot"},{"product":"dovecot","vendor":"open-xchange"}],"cvss":{"score":3.1,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"}],"description":"Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.","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":"Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no.","id":"CVE-2026-40020","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"dovecot:dovecot","products":["dovecot:dovecot"],"type":null,"year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters","id":"CVE-2026-40021"},"packages":[],"prev":{"headline":"Denial of service in OX Dovecot CE","id":"CVE-2026-40019"},"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":"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":null,"url":"https://insights.sbomify.com/CVE-2026-40020/"}