CVE-2026-40861— Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-40861
Vulnerability Information
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Vulnerability Title
Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler
Source: NVD (National Vulnerability Database)
Vulnerability Description
A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack — e.g. `/etc/passwd` or `airflow.cfg`) or (b) supply a `task_id` containing `..` sequences accepted by the Task SDK's `KEY_REGEX` (write-path attack), and in both cases the FileTaskHandler resolves the log path outside the configured `base_log_folder`, leaking or overwriting arbitrary files. Only affects deployments where the worker log folder is shared with the API server. Users are advised to upgrade to `apache-airflow` 3.2.2 or later. As a defense-in-depth mitigation, deploy the worker and API server with separate log volumes so that worker-controlled paths cannot reach the API server's filesystem.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Airflow | 0 ~ 3.2.2 | - |
II. Public POCs for CVE-2026-40861
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|---|
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Patches & Fixes for CVE-2026-40861 (1)
Mailing List Discussions for CVE-2026-40861 (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-2026-45192 | Apache Airflow: Incomplete Redaction of Sensitive Fields in Connection Extra API Response | |
| CVE-2026-49328 | Apache Fesod (Incubating): Improper validation of user-supplied URLs leading to SSRF | |
| CVE-2026-35563 | Apache Directory LDAP API: LDAP client implementation does not verify if the server certif | |
| CVE-2026-49270 | Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: Durable Subscription Disclos | |
| CVE-2026-49157 | Apache ActiveMQ: Authenticated low-privilege Web users retain Jolokia broker-management ca | |
| CVE-2026-46605 | Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incomplete authorization dur | |
| CVE-2026-45505 | Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Jolokia `addNetworkConnector | |
| CVE-2026-42588 | Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Remote Code Execution via Jo | |
| CVE-2026-42253 | Apache ActiveMQ, Apache ActiveMQ Web: HTTP Response Header Injection via JMS Message Prope | |
| CVE-2026-49298 | Apache Airflow: JWT Token Exposure in KubernetesExecutor Command-Line Arguments | |
| CVE-2026-48726 | Apache Airflow: revoke_token() unreachable in FabAuthManager / KeycloakAuthManager logout | |
| CVE-2026-46764 | Apache Airflow: Event Log detail endpoint bypasses DAG-scoped event log permission filter | |
| CVE-2026-45426 | Apache Airflow: Log server JWT authorization bypass via Python lstrip() character strippin | |
| CVE-2026-45360 | Apache Airflow: Arbitrary import in custom deadline-reference deserialization | |
| CVE-2026-42359 | Apache Airflow: Authenticated RCE via XCom PATCH endpoint — XComUpdateBody missing FORBIDD | |
| CVE-2026-42358 | Apache Airflow: Variable masker depth-limit bypass returns cleartext nested secrets | |
| CVE-2026-42360 | Apache Airflow: Rendered template truncation bypasses nested sensitive-key masking | |
| CVE-2026-42252 | Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user patter |
Showing top 20 of 28 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Apache Airflow
- CVE-2026-40961
Apache Airflow: Open Redirect Bypass Vulnerability - CVE-2026-40963
Apache Airflow: DAG authorization bypass on /ui/structure/st - CVE-2026-41014
Apache Airflow: per-DAG RBAC bypass on /ui/partitioned_dag_r - CVE-2026-49267
Apache Airflow: No certificate validation on SMTP STARTTLS c - CVE-2026-41017
Apache Airflow: JWT cookie missing Secure flag in JWTRefresh
Same vendor: Apache Software Foundation
- CVE-2026-49328
Apache Fesod (Incubating): Improper validation of user-suppl - CVE-2026-48827
Apache MINA SSHD: Path traversal in org.apache.sshd:sshd-git - CVE-2026-44825
Apache Solr: Enabling BasicAuth using bin/solr CLI configure - CVE-2026-49361
Apache Fluss Netty Frame Decoder Memory Exhaustion Vulnerabi - CVE-2026-40961
Apache Airflow: Open Redirect Bypass Vulnerability
Same weakness: CWE-59
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My Image Garden v3.6.8及以前版本安装器符号链接处理不当漏洞 - CVE-2026-45403
AnythingLLM: filesystem-copy-file follows nested symlinks an - CVE-2026-44881
Portainer: Arbitrary File Read via Git Symlink Injection in - CVE-2026-9804
Kubevirt: kubevirt: vmexport directory symlink escape enable
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