{"id":"CVE-2026-49267","aliases":["GHSA-799x-qp47-8qwq","BIT-airflow-2026-49267"],"title":"Apache Airflow has no certificate validation on SMTP STARTTLS connections","summary":"Apache Airflow has no certificate validation on SMTP STARTTLS connections","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","vendor":"apache-airflow","product":"apache-airflow","ecosystem":"pip","affected":["apache-airflow >= 2.0.0, < 3.2.2"],"patched":["apache-airflow 3.2.2"],"published":"2026-06-01","updated":"2026-07-09","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-799x-qp47-8qwq","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49267"},{"url":"https://github.com/apache/airflow/pull/65346"},{"url":"https://github.com/apache/airflow"},{"url":"https://lists.apache.org/thread/6v2ds757000msmjmovnnqryqzks83ps0"}],"tags":["osv","pip"],"epss":0.00185,"epssPercentile":0.08321,"ingestedAt":"2026-07-10T13:49:10.582Z","slug":"CVE-2026-49267","body":"## Overview\n\nApache 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.\n\n## Affected packages\n\n- `apache-airflow >= 2.0.0, < 3.2.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `apache-airflow 3.2.2`","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}