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CVE-2026-49267— Apache Airflow: No certificate validation on SMTP STARTTLS connections

Quick assessment

Affected
Apache Software Foundation Apache Airflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Airflow是美国阿帕奇（Apache）基金会的一套具有创建、管理和监控工作流程功能的开源平台。该平台具有可扩展和动态监控等特点。 Apache Airflow 3.2.2之前版本存在信任管理问题漏洞，该漏洞源于EmailOperator和底层airflow.utils.email帮助程序在建立SMTP STARTTLS连接时未验证远程证书，可能导致中间人攻击者捕获SMTP AUTH凭据和消息内容。

AI Predicted 8.5 Difficulty: Easy EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Airflow 2.0.0< 3.2.2 affected
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I. Basic Information for CVE-2026-49267

Vulnerability Information
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Vulnerability Title
Apache Airflow: No certificate validation on SMTP STARTTLS connections
Source: CVE Program / CVE List V5
Vulnerability 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. This 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. Users are advised to upgrade to `apache-airflow` 3.2.2 or later.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Airflow 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Airflow是美国阿帕奇（Apache）基金会的一套具有创建、管理和监控工作流程功能的开源平台。该平台具有可扩展和动态监控等特点。 Apache Airflow 3.2.2之前版本存在信任管理问题漏洞，该漏洞源于EmailOperator和底层airflow.utils.email帮助程序在建立SMTP STARTTLS连接时未验证远程证书，可能导致中间人攻击者捕获SMTP AUTH凭据和消息内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Airflow 2.0.0 ~ 3.2.2 -

II. Public POCs for CVE-2026-49267

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III. Intelligence Information for CVE-2026-49267

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Patches & Fixes for CVE-2026-49267 (1)

Mailing List Discussions for CVE-2026-49267 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-01 · 28 CVEs total

CVE-2026-44825 8.1 HIGH Apache Solr: Enabling BasicAuth using bin/solr CLI configures additional insecure users
CVE-2026-48827 7.1 HIGH Apache MINA SSHD: Path traversal in org.apache.sshd:sshd-git
CVE-2026-42359 Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDD
CVE-2026-49328 Apache Fesod (Incubating): Improper validation of user-supplied URLs leading to SSRF
CVE-2026-49361 Apache Fluss Netty Frame Decoder Memory Exhaustion Vulnerability
CVE-2026-40861 Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler
CVE-2026-40961 Apache Airflow: Open Redirect Bypass Vulnerability
CVE-2026-40963 Apache Airflow: DAG authorization bypass on /ui/structure/structure_data
CVE-2026-41014 Apache Airflow: per-DAG RBAC bypass on /ui/partitioned_dag_runs endpoints
CVE-2026-41017 Apache Airflow: JWT cookie missing Secure flag in JWTRefreshMiddleware behind HTTPS-termin
CVE-2026-41084 Apache Airflow: API authorization bypass: bulk TaskInstances allows cross-DAG mutation
CVE-2026-42252 Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user patter
CVE-2026-42360 Apache Airflow: Rendered template truncation bypasses nested sensitive-key masking
CVE-2026-42358 Apache Airflow: Variable masker depth-limit bypass returns cleartext nested secrets
CVE-2026-45192 Apache Airflow: Incomplete Redaction of Sensitive Fields in Connection Extra API Response
CVE-2026-45360 Apache Airflow: Arbitrary import in custom deadline-reference deserialization
CVE-2026-45426 Apache Airflow: Log server JWT authorization bypass via Python lstrip() character strippin
CVE-2026-46764 Apache Airflow: Event Log detail endpoint bypasses DAG-scoped event log permission filter
CVE-2026-48726 Apache Airflow: revoke_token() unreachable in FabAuthManager / KeycloakAuthManager logout
CVE-2026-49298 Apache Airflow: JWT Token Exposure in KubernetesExecutor Command-Line Arguments

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Apache Airflow
Same vendor: Apache Software Foundation
Same weakness: CWE-295

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