{"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-2026-100700 exists.","fix":"Upgrade nodemailer to 10.0.6 or later.","what":"CVE-2026-100700 is a high-severity denial of service vulnerability in nodemailer, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-100700 and fix it if it is affected.\n\nWhat it is: CVE-2026-100700 is a high-severity denial of service vulnerability in nodemailer, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100700 exists.\n\nAffected packages and fixed versions:\n- nodemailer (npm): affected all versions; fixed in 10.0.6\n- nodemailer (npm): affected all versions; fixed in 10.0.6\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-2026-100700/ (Markdown: https://insights.sbomify.com/CVE-2026-100700/index.md)","id":"CVE-2026-100700","markdown":"https://insights.sbomify.com/CVE-2026-100700/index.md","name":"CVE-2026-100700","record":{"aliases":["CLEANSTART-2026-TF67496","CLEANSTART-2026-UX56548","CLSA-2026-1790863073","CLSA-2026-1790937712","CLSA-2026-1791028046","DEBIAN-CVE-2026-100700","ECHO-cde4-c12a-3080","GHSA-c7vw-frhj-6h9j","GHSA-v53p-9fqp-m79j","MINI-3v92-j972-3cq5","MINI-4mfg-xm9f-g69m","MINI-6fh4-7ff5-38gc","MINI-6wrh-5rg4-5fcg","MINI-7hx9-34jg-gvfm","MINI-7rf7-4vfr-53mx","MINI-cfw7-g8w3-qmxg","MINI-fj6v-r6rv-c5cq","MINI-fvjh-8q3p-jrg3","MINI-gqwj-pvj8-3hpg","MINI-gxf5-xqhg-r893","MINI-hwx9-x866-5j2q","MINI-mpw8-mhpp-jmj4","MINI-rp6f-ghg6-9v2w","MINI-v4p4-8gvq-j72w","ROOT-APP-NPM-GHSA-v53p-9fqp-m79j","UBUNTU-CVE-2026-100700"],"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":"none","summary":"Attackers can cause service unavailability in applications using nodemailer by sending crafted email headers that trigger quadratic backtracking in the address parser.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.","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 before 10.0.6 Denial of Service via addressparser","id":"CVE-2026-100700","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 5.0.0 through 10.0.1 TLS servername Cache Confusion","id":"CVE-2026-100701"},"packages":[{"ecosystem":"npm","fixed":["10.0.6"],"introduced":["0"],"last_affected":[],"package":"nodemailer","purl":null,"source":"GHSA-v53p-9fqp-m79j"},{"ecosystem":"npm","fixed":["10.0.6"],"introduced":["0"],"last_affected":[],"package":"nodemailer","purl":"pkg:npm/nodemailer","source":"GHSA-v53p-9fqp-m79j"}],"prev":{"headline":"Nodemailer before 10.0.9 Malformed Envelope Recipient via RFC 5322 Comment","id":"CVE-2026-100699"},"products":["nodemailer"],"published":"2026-09-26","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-28","vendors":["nodemailer"]},"summary":"Attackers can cause service unavailability in applications using nodemailer by sending crafted email headers that trigger quadratic backtracking in the address parser.","url":"https://insights.sbomify.com/CVE-2026-100700/"}