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Vulnerabilities

Security research · CVE-2026-49267

Apache Airflow's EmailOperator and the underlying helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used witho…

Published Jun 1, 2026 · catalog updated Jul 21, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-49267. EPSS is 0.27%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.27%
Remediation
Not established
Affected products
cpe apache/airflow

Apache Airflow's EmailOperator and the underlying helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used without . 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. This CVE covers the **core apache-airflow side** of the same root cause already covered for the SMTP provider by (published 2026-04-27, covering ). Users who already applied the SMTP-provider fix from CVE-2026-41016 should additionally upgrade to 3.2.2 or later to cover the core-side path through . Affects deployments configured with and where the SMTP relay is reachable across a less-trusted network segment than the worker. Users are advised to upgrade to 3.2.2 or later.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/airflowversion unspecified

How to fix CVE-2026-49267

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-49267. EPSS is 0.27%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-295: Improper Certificate Validation. EPSS 0.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 1, 2026 · NIST NVD

    Detected

    Apache Airflow's EmailOperator and the underlying helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used without . 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

  2. Jul 21, 2026 · NIST NVD

    Updated

    Apache Airflow's EmailOperator and the underlying helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used without . 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

Sources

  • CVE.orgVulnerability recordCVE-2026-49267

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-49267

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-49267

    Apache Airflow's EmailOperator and the underlying helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used without . An attacker positioned between the work

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.