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The vulnerability (CVE-2026-?????) exists because the Fleet application does not enforce role-based access controls on its `/debug/pprof/` endpoints. These endpoints, intended for performance profiling, are exposed to any user who has completed basic authentication. An attacker with a low-privilege “Observer” account can send HTTP GET requests to paths like `/debug/pprof/heap` or /debug/pprof/profile. The `/debug/pprof/profile` endpoint actively profiles the CPU for a default 30 seconds, consuming significant resources and potentially causing a denial-of-service. Access to other endpoints like heap, goroutine, or `trace` allows the attacker to dump detailed runtime memory information, revealing sensitive application internals and possibly leaking secrets or intellectual property embedded in the codebase.
Platform: Fleet
Version: Pre-patch
Vulnerability: Access Control Bypass
Severity: High
date: 2026-01-20
Prediction: Patch by 2026-01-27
What Undercode Say:
`curl -u observer:password https://fleet-server/debug/pprof/heap > heap.dump`
`curl -u observer:password https://fleet-server/debug/pprof/profile?seconds=60`
`gobuster dir -u https://fleet-server/debug/ -w common-pprof-paths.txt`
How Exploit:
1. Attacker authenticates with low-privilege credentials.
2. Attacker enumerates or directly accesses `/debug/pprof/` endpoints.
- Attacker retrieves memory profiles or triggers CPU profiling for DoS.
Protection from this CVE:
Upgrade Fleet immediately.
Implement IP allowlisting.
Disable debug endpoints.
Impact:
Information Disclosure.
Denial of Service.
Internal State Exposure.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
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