Security vulnerabilities and automated fixes for rate limiting issues
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A critical rate limiting vulnerability in an Express.js application allowed attackers to bypass API throttling through IP rotation and header manipulation. This fix demonstrates how improperly configured rate limiters can be circumvented through proxy networks, VPNs, and forged X-Forwarded-For headers, potentially enabling brute force attacks, credential stuffing, and resource exhaustion.
A medium-severity vulnerability (CVE-2026-24842) in node-tar allowed attackers to create arbitrary files outside intended directories by exploiting a flaw in hardlink security checks. Combined with missing rate limiting controls, this vulnerability exposed applications to both path traversal attacks and denial-of-service through unlimited automated requests. Here's what happened and how to protect your applications.