CVE-2026-55814 Overview
CVE-2026-55814 is a missing authentication vulnerability affecting Apache Ranger versions <= 2.8.0. The flaw resides in the Ranger Download APIs, which fail to enforce authentication on requests. Remote, unauthenticated attackers can query these endpoints over the network to retrieve sensitive policy and configuration data managed by Ranger. The issue is tracked under CWE-306: Missing Authentication for Critical Function. Apache has released version 2.9.0 to remediate the flaw.
Critical Impact
Unauthenticated network attackers can retrieve Apache Ranger policy and configuration data through the Download APIs, exposing access-control metadata for downstream Hadoop, Hive, HDFS, and Kafka services.
Affected Products
- Apache Ranger versions <= 2.8.0
- Ranger Admin service exposing Download APIs
- Downstream integrations relying on Ranger policy distribution (Hadoop, Hive, HDFS, HBase, Kafka plugins)
Discovery Timeline
- 2026-08-10 - CVE-2026-55814 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-55814
Vulnerability Analysis
Apache Ranger is a centralized framework for defining, administering, and auditing fine-grained access policies across the Hadoop ecosystem. The Ranger Admin server exposes Download APIs that Ranger plugins call to fetch policies, tags, roles, and user or group information. In versions up to and including 2.8.0, these endpoints do not enforce authentication checks. Any client capable of reaching the Ranger Admin HTTP interface can issue download requests and receive policy data in response.
Exposure of Ranger policy content reveals the authoritative access-control model applied across connected data services. Attackers gain visibility into resource names, user and group assignments, policy conditions, and mask or row-filter rules. This information supports reconnaissance for follow-on attacks against Hive tables, HDFS paths, Kafka topics, or Kubernetes clusters governed by Ranger.
The EPSS score is 0.482% with a percentile of 39.37 as of 2026-08-14.
Root Cause
The root cause is a missing authentication check on the Download API request handlers within the Ranger Admin service. Endpoints intended to serve authenticated Ranger plugins accept anonymous requests, returning policy artifacts without verifying caller identity or plugin credentials.
Attack Vector
Exploitation requires only network access to the Ranger Admin HTTP or HTTPS listener. An attacker sends a crafted GET request to the vulnerable download endpoint, bypasses the missing authentication layer, and receives serialized policy data. No user interaction, privileges, or prior compromise is required. See the Apache Mailing List Discussion and the Openwall OSS Security Update for advisory details.
Detection Methods for CVE-2026-55814
Indicators of Compromise
- Unauthenticated HTTP requests to Ranger Admin download endpoints such as /service/plugins/policies/download/*, /service/tags/download/*, or /service/roles/download/*
- Access log entries showing successful 200 responses to download URIs without a valid session cookie or Basic Auth header
- Requests to Ranger Admin originating from source addresses outside the expected plugin subnet
Detection Strategies
- Parse Ranger Admin access logs (access_log.YYYY-MM-DD.log) and alert on download API calls that lack authentication tokens or originate from non-plugin hosts
- Correlate anomalous download volume per source IP against baseline plugin polling intervals
- Deploy web application firewall rules that require an authenticated principal on /service/*/download/* URIs
Monitoring Recommendations
- Forward Ranger Admin, Tomcat, and reverse-proxy logs into a SIEM for continuous inspection of download endpoint activity
- Track HTTP 4xx versus 2xx ratios on download URIs to detect enumeration attempts
- Monitor egress traffic from the Ranger Admin host for unusually large policy payload responses
How to Mitigate CVE-2026-55814
Immediate Actions Required
- Upgrade Apache Ranger Admin to version 2.9.0 or later on all clusters
- Restrict network access to the Ranger Admin HTTP or HTTPS listener using firewall rules or security groups, allowing only Ranger plugin hosts
- Rotate Ranger service credentials and plugin keystores after patching to invalidate any material exposed through prior downloads
Patch Information
Apache Ranger 2.9.0 fixes CVE-2026-55814 by enforcing authentication on the Download APIs. Administrators should upgrade both the Ranger Admin server and dependent Ranger plugins to compatible versions. Review the Apache Mailing List Discussion for release coordination guidance.
Workarounds
- Place Ranger Admin behind an authenticating reverse proxy that rejects anonymous requests to /service/*/download/* paths
- Apply network segmentation so that only Ranger plugin nodes can reach the Admin service, blocking all other clients at the perimeter
- Enable Ranger Admin Kerberos or SSL client-certificate authentication if operationally feasible until the upgrade completes
# Example iptables restriction limiting Ranger Admin access to plugin subnet
iptables -A INPUT -p tcp --dport 6080 -s 10.20.30.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 6080 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
