CVE-2026-2377 Overview
A Server-Side Request Forgery (SSRF) vulnerability has been discovered in mirror-registry. Authenticated users can exploit the log export feature by providing a specially crafted URL, allowing the application's backend to make arbitrary requests to internal network resources. This vulnerability could lead to unauthorized access to sensitive information or other internal systems that would otherwise be inaccessible from external networks.
Critical Impact
Authenticated attackers can leverage the SSRF vulnerability to access internal network resources, potentially exposing sensitive configuration data, cloud metadata endpoints, and other internal services not intended for external access.
Affected Products
- mirror-registry (all versions prior to patch)
Discovery Timeline
- 2026-04-08 - CVE-2026-2377 published to NVD
- 2026-04-08 - Last updated in NVD database
Technical Details for CVE-2026-2377
Vulnerability Analysis
This vulnerability is classified under CWE-918 (Server-Side Request Forgery). The flaw exists in the log export functionality of mirror-registry, where user-supplied URLs are insufficiently validated before the backend server initiates HTTP requests. An authenticated user can craft malicious URLs targeting internal resources such as cloud provider metadata services (e.g., 169.254.169.254), internal APIs, or other network-accessible services within the infrastructure.
The SSRF vulnerability allows attackers to bypass network segmentation and firewall rules by using the mirror-registry server as a proxy. Since the requests originate from a trusted internal server, they may be granted access to resources that would normally block external connections.
Root Cause
The root cause stems from insufficient input validation and sanitization of user-provided URLs in the log export feature. The application fails to implement proper allowlist-based URL validation, permitting requests to arbitrary destinations including internal IP ranges, localhost addresses, and potentially sensitive cloud metadata endpoints.
Attack Vector
The vulnerability is exploitable over the network by authenticated users. An attacker with valid credentials to the mirror-registry can submit a crafted URL through the log export functionality. The backend server then makes a request to the attacker-specified destination, returning the response content or confirming the existence of internal resources.
Common attack scenarios include:
- Accessing cloud provider metadata services to obtain instance credentials
- Port scanning internal networks to discover services
- Accessing internal REST APIs or administrative interfaces
- Reading sensitive configuration files via internal file servers
Detection Methods for CVE-2026-2377
Indicators of Compromise
- Unusual outbound HTTP requests from the mirror-registry server to internal IP addresses (e.g., 10.x.x.x, 172.16.x.x, 192.168.x.x)
- Log entries showing log export requests targeting cloud metadata endpoints such as 169.254.169.254
- Unexpected access patterns to internal services originating from the mirror-registry host
- Network connections from mirror-registry to previously unobserved internal destinations
Detection Strategies
- Monitor application logs for log export requests containing internal IP addresses or localhost references
- Implement network monitoring rules to alert on mirror-registry connections to internal-only subnets
- Review web application firewall (WAF) logs for suspicious URL patterns in log export requests
- Deploy network segmentation monitoring to detect anomalous traffic flows from the mirror-registry server
Monitoring Recommendations
- Enable detailed logging for all log export feature requests including the target URL
- Configure network intrusion detection systems (IDS) to flag SSRF-indicative traffic patterns
- Implement egress filtering alerts for connections from mirror-registry to internal IP ranges
- Set up automated alerting for access attempts to cloud metadata endpoints
How to Mitigate CVE-2026-2377
Immediate Actions Required
- Review and audit all log export functionality usage for suspicious URL patterns
- Implement network-level egress filtering to restrict mirror-registry outbound connections
- Block access to cloud metadata endpoints (169.254.169.254) from the mirror-registry server
- Monitor for exploitation attempts while awaiting a security patch
Patch Information
A security patch is expected from the vendor. Monitor the Red Hat CVE-2026-2377 Advisory for official updates and patching guidance. Additional details are tracked in Red Hat Bug Report #2439201.
Workarounds
- Implement strict allowlist-based URL validation at the application or WAF level to permit only known-safe external destinations
- Deploy network segmentation to isolate mirror-registry from sensitive internal resources
- Configure firewall rules to block mirror-registry from accessing internal IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and the link-local range (169.254.0.0/16)
- Consider disabling the log export feature if not critical to operations until a patch is available
# Example iptables rules to block SSRF attempts from mirror-registry host
# Block access to cloud metadata endpoint
iptables -A OUTPUT -d 169.254.169.254 -j DROP
# Block access to private IP ranges from the server
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -d 127.0.0.0/8 -j DROP
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