Agent of the Day – September 25, 2026
Most security scanners are optimized for one thing: finding something to report. That incentive quietly rewards noise — every string concatenation near a shell call becomes a “finding,” every developer inherits a triage queue full of things that were never actually exploitable. Today’s Agent of the Day takes the opposite approach. Meet the Daily VulnHunter Scan, a Claude Code workflow that hunts for injection-class bugs in gh-aw’s own source and treats “no findings” as a perfectly good outcome.
Agent of the Day: Daily VulnHunter Scan
Section titled “Agent of the Day: Daily VulnHunter Scan ”VulnHunter runs Capital One’s open-sourced vulnhunt methodology inside a sandboxed bundle of the repository — a snapshot of pkg/cli, pkg/parser, pkg/workflow, and actions/setup/js, plus a reference guide (phase2_class_inj.md) covering the usual dangerous-sink suspects: SQL injection, command injection, path traversal, SSRF, XXE, unrestricted file upload, XSS, open redirect, LDAP injection, and server-side template injection. Each day it works through a ranked candidate list, checking whether attacker- or LLM-controlled data can reach one of those sinks unsanitized.
On September 24 (run 35961274043), the agent reviewed 25 of 41 candidates and flagged exactly one soft lead: an unsanitized branch argument passed into git checkout -b inside actions/setup/js/apply_samples.cjs, which on paper looks like a textbook CWE-88 flag-injection risk. But instead of filing an issue on pattern-match alone, VulnHunter ran it through a reachability gate — tracing where that branch value actually originates. It found the input comes from