CVE-2026-30350: Agent Protocol Server DoS Vulnerability

CVE-2026-30350 Overview

A Denial of Service (DoS) vulnerability exists in the Agent Protocol server at commit e9a89f. The vulnerability resides in the /store/items/search endpoint, which can be exploited by attackers through specially crafted POST requests to exhaust server resources and render the service unavailable.

Critical Impact

Attackers can remotely disrupt Agent Protocol server availability without authentication, potentially impacting dependent services and workflows that rely on the search functionality.

Affected Products

• Agent Protocol server (commit e9a89f and potentially related versions)
• Aegra project implementations using the affected Agent Protocol server

Discovery Timeline

• 2026-04-27 - CVE-2026-30350 published to NVD
• 2026-04-27 - Last updated in NVD database

Technical Details for CVE-2026-30350

Vulnerability Analysis

This vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption), indicating that the /store/items/search endpoint lacks proper controls to limit resource consumption when processing incoming requests. The endpoint is accessible over the network and requires no authentication or privileges to exploit, making it particularly dangerous for internet-facing deployments.

When a malicious POST request is sent to the vulnerable endpoint, the server fails to properly validate or constrain the request parameters, allowing an attacker to trigger excessive resource utilization. This can manifest as CPU exhaustion, memory exhaustion, or thread pool depletion depending on the specific implementation details.

Root Cause

The root cause of this vulnerability is improper input validation and missing resource consumption limits in the /store/items/search endpoint handler. The endpoint does not adequately sanitize or constrain incoming POST request payloads, allowing attackers to craft requests that trigger resource-intensive operations without appropriate throttling or bounds checking.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted POST requests to the /store/items/search endpoint. The attack can be executed remotely against any accessible instance of the Agent Protocol server running the vulnerable commit.

The exploitation is straightforward:

1. Attacker identifies a target Agent Protocol server instance
2. Attacker crafts a malicious POST request designed to consume excessive server resources
3. Attacker sends the request to the /store/items/search endpoint
4. Server resources become exhausted, causing denial of service for legitimate users

Technical details regarding the specific payload structure that triggers the vulnerability can be found in the GitHub Gist resource associated with this CVE.

Detection Methods for CVE-2026-30350

Indicators of Compromise

• Unusual spike in POST requests targeting the /store/items/search endpoint
• Server resource exhaustion (high CPU utilization, memory consumption, or thread depletion)
• Abnormally large or malformed request bodies in web server access logs
• Service unavailability or degraded response times for legitimate search queries

Detection Strategies

• Implement rate limiting and request monitoring on the /store/items/search endpoint to identify anomalous traffic patterns
• Configure web application firewall (WAF) rules to detect and block requests with suspicious payload characteristics
• Deploy application performance monitoring (APM) to alert on sudden resource consumption spikes
• Enable detailed logging for POST requests to the affected endpoint and analyze for malicious patterns

Monitoring Recommendations

• Monitor server resource utilization metrics (CPU, memory, connection pools) with alerting thresholds
• Track request rates and payload sizes for the /store/items/search endpoint
• Implement health checks that can detect service degradation before complete outage
• Review application logs regularly for patterns consistent with DoS attempts

How to Mitigate CVE-2026-30350

Immediate Actions Required

• Apply rate limiting to the /store/items/search endpoint to restrict request frequency per client
• Implement request payload size limits to prevent oversized malicious requests
• Deploy network-level protections such as WAF rules or DDoS mitigation services
• Consider temporarily restricting access to the endpoint to trusted IP ranges if feasible
• Update to a patched version of the Agent Protocol server when available

Patch Information

No official patch has been confirmed at this time. Monitor the Aegra project repository for updates and security advisories. Users should check for commits after e9a89f that address this vulnerability in the search endpoint handler.

Workarounds

• Deploy a reverse proxy with rate limiting capabilities in front of the Agent Protocol server
• Implement input validation at the application or middleware layer to constrain request parameters
• Configure resource limits (connection timeouts, memory caps) to prevent complete service exhaustion
• Use network segmentation to limit exposure of the vulnerable endpoint to untrusted networks

# Example nginx rate limiting configuration for the affected endpoint
limit_req_zone $binary_remote_addr zone=search_limit:10m rate=10r/s;

location /store/items/search {
    limit_req zone=search_limit burst=20 nodelay;
    limit_req_status 429;
    proxy_pass http://agent_protocol_backend;
}