{"answers":{"affected":"2 open source packages ship an affected version, including nodemailer.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110871 exists.","fix":"Upgrade nodemailer to 10.0.10 or later.","what":"CVE-2026-110871 is a high-severity denial of service vulnerability in nodemailer, published on 14 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-2026-110871 and fix it if it is affected.\n\nWhat it is: CVE-2026-110871 is a high-severity denial of service vulnerability in nodemailer, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110871 exists.\n\nAffected packages and fixed versions:\n- nodemailer (npm): affected from 3.0.0; fixed in 10.0.10\n- nodemailer (npm): affected from 3.0.0; fixed in 10.0.10\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-2026-110871/ (Markdown: https://insights.sbomify.com/CVE-2026-110871/index.md)","id":"CVE-2026-110871","markdown":"https://insights.sbomify.com/CVE-2026-110871/index.md","name":"CVE-2026-110871","record":{"aliases":["CLSA-2026-1792486237","CLSA-2026-1792495264","CLSA-2026-1792505981","CLSA-2026-1792509085","CLSA-2026-1792518061","CLSA-2026-1792524218","CLSA-2026-1792575070","DEBIAN-CVE-2026-110871","ECHO-af5a-91fd-55de","GHSA-39m8-27wv-hr27","UBUNTU-CVE-2026-110871"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js email library","requires_auth":"low_privilege","summary":"Attackers can cause denial of service by exhausting CPU resources through quadratic header unfolding in Nodemailer's DKIM signing process.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Nodemailer 3.0.0 before 10.0.10 Quadratic DKIM Header Unfolding Denial of Service","id":"CVE-2026-110871","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing","id":"CVE-2026-110872"},"packages":[{"ecosystem":"npm","fixed":["10.0.10"],"introduced":["3.0.0"],"last_affected":[],"package":"nodemailer","purl":null,"source":"GHSA-39m8-27wv-hr27"},{"ecosystem":"npm","fixed":["10.0.10"],"introduced":["3.0.0"],"last_affected":[],"package":"nodemailer","purl":"pkg:npm/nodemailer","source":"GHSA-39m8-27wv-hr27"}],"prev":{"headline":"Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Comments","id":"CVE-2026-110870"},"products":["nodemailer"],"published":"2026-10-14","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-20","vendors":["nodemailer"]},"summary":"Attackers can cause denial of service by exhausting CPU resources through quadratic header unfolding in Nodemailer's DKIM signing process.","url":"https://insights.sbomify.com/CVE-2026-110871/"}