{"cve":"CVE-2026-49267","nvd":{"published":"2026-06-01T09:16:20.543","modified":"2026-07-21T19:10:00.107","status":"Analyzed","description":"Apache Airflow's EmailOperator and the underlying `airflow.utils.email` helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used `[email] smtp_starttls=True` without `[email] smtp_ssl`. An attacker positioned between the worker and the configured SMTP server (network MITM — typical hostile-network attack-surface for environments where the SMTP relay sits outside the worker's trust boundary) could present a self-signed certificate, have the worker complete the STARTTLS handshake silently, and capture the SMTP AUTH credentials and message contents the worker forwarded.\n\nThis CVE covers the **core apache-airflow side** of the same root cause already covered for the SMTP provider by `CVE-2026-41016` (published 2026-04-27, covering `apache-airflow-providers-smtp`). Users who already applied the SMTP-provider fix from CVE-2026-41016 should additionally upgrade `apache-airflow` to 3.2.2 or later to cover the core-side path through `airflow.utils.email`. Affects deployments configured with `smtp_starttls=True` and `smtp_ssl=False` where the SMTP relay is reachable across a less-trusted network segment than the worker.\n\nUsers are advised to upgrade to `apache-airflow` 3.2.2 or later.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-295"],"references":["https://github.com/apache/airflow/pull/65346","https://lists.apache.org/thread/6v2ds757000msmjmovnnqryqzks83ps0"],"products":["apache:airflow"],"source":"nvd","synced_at":"2026-10-19T22:37:48.043517290+00:00"},"epss":{"cve":"CVE-2026-49267","score":0.00185,"percentile":0.08095,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-799x-qp47-8qwq","url":"https://osv.dev/vulnerability/GHSA-799x-qp47-8qwq","summary":"Apache Airflow has no certificate validation on SMTP STARTTLS connections","modified":"2026-07-13T16:43:53.054020376Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=2.0.0 <3.2.2"],"fixed":["3.2.2"]}]},{"id":"PYSEC-2026-2346","url":"https://osv.dev/vulnerability/PYSEC-2026-2346","summary":"Apache Airflow has no certificate validation on SMTP STARTTLS connections","modified":"2026-07-13T16:43:53.054020376Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=2.0.0 <3.2.2"],"fixed":["3.2.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}