CVE-2026-86506: JetBrains GoLand Auth Bypass Vulnerability

CVE-2026-86506 Overview

CVE-2026-86506 is a missing authentication vulnerability [CWE-306] in JetBrains GoLand versions prior to 2026.2.2.1. The GoLand profiler injects a pprof server into the target Go application to collect runtime profiling data. That injected server exposes its endpoints without any authentication controls. Any actor able to reach the profiler's listening port can retrieve profiling data, including CPU profiles, heap snapshots, goroutine stacks, and command-line arguments. This information can reveal sensitive application internals, memory contents, and execution behavior to unauthorized parties.

Critical Impact
Unauthenticated network attackers can retrieve pprof profiling data from GoLand-profiled Go applications, exposing memory contents, goroutine state, and command-line arguments that may contain secrets.

Affected Products

JetBrains GoLand versions prior to 2026.2.2.1
Go applications launched via the GoLand profiler with the injected pprof server
Development and CI environments running vulnerable GoLand profiling sessions

Discovery Timeline

2026-09-07 - CVE-2026-86506 published to the National Vulnerability Database
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-86506

Vulnerability Analysis

The GoLand profiler instruments a target Go program by injecting an HTTP pprof server into the running process. The Go standard library's net/http/pprof package registers handlers such as /debug/pprof/heap, /debug/pprof/profile, /debug/pprof/goroutine, and /debug/pprof/cmdline. These endpoints return low-level runtime information intended strictly for developer diagnostics.

In vulnerable GoLand builds, the injected server binds without authentication, transport encryption, or access control. Any client that can reach the listening socket receives full profiling responses. Heap and allocation profiles can leak in-memory strings, credentials, tokens, and business data. Goroutine dumps expose call stacks and code paths. The /debug/pprof/cmdline endpoint returns the process command line, which frequently contains connection strings and API keys in development workflows.

Exploitation requires network reachability to the profiler port and does not require user interaction or prior privileges. The CVSS attack complexity is rated high, reflecting the need to locate the ephemeral profiler port during an active session.

Root Cause

The root cause is a missing authentication control [CWE-306] on the profiler-injected HTTP listener. The profiler enables the pprof mux without wrapping it in an authentication middleware, token check, or loopback-only bind. Any exposure of the port to non-local interfaces makes the data accessible to remote callers.

Attack Vector

An attacker on the same network segment, or with routing access to the developer workstation or build agent, scans for the profiler's HTTP port. Once identified, the attacker issues standard pprof requests such as GET /debug/pprof/heap or GET /debug/pprof/cmdline and downloads profiling payloads. The attacker can then analyze the heap dump offline using go tool pprof to extract sensitive strings, or replay cmdline output to harvest secrets passed as arguments. No exploitation code is required beyond a standard HTTP client. Refer to the JetBrains Security Issues Fixed page for vendor details.

Detection Methods for CVE-2026-86506

Indicators of Compromise

Unexpected inbound HTTP requests to developer workstations or build agents targeting paths under /debug/pprof/
Outbound traffic from profiled Go processes returning large binary responses to non-local IP addresses
Profiler processes listening on non-loopback interfaces during active GoLand sessions

Detection Strategies

Inspect network telemetry for HTTP GET requests to URIs containing /debug/pprof/heap, /debug/pprof/profile, /debug/pprof/goroutine, or /debug/pprof/cmdline
Enumerate listening sockets on developer endpoints and alert when GoLand-spawned Go processes bind pprof handlers on 0.0.0.0 rather than 127.0.0.1
Correlate GoLand process launches with new inbound TCP flows from unexpected source addresses

Monitoring Recommendations

Baseline the expected network exposure of developer workstations and flag deviations that include high-numbered listening ports tied to GoLand child processes
Log and retain HTTP access records on any host running Go debug builds to support post-incident review
Monitor for use of go tool pprof against internal IP ranges, which can indicate reconnaissance or data collection

How to Mitigate CVE-2026-86506

Immediate Actions Required

Upgrade JetBrains GoLand to version 2026.2.2.1 or later on all developer workstations and CI runners
Terminate any active profiling sessions started on vulnerable GoLand builds until patched
Restrict developer workstations to trusted network segments and block inbound access to ephemeral high ports

Patch Information

JetBrains addressed the missing authentication issue in GoLand 2026.2.2.1. The fixed release restricts exposure of the injected pprof server. Confirm remediation details on the JetBrains Security Issues Fixed advisory page.

Workarounds

Enforce host-based firewall rules that limit pprof listener ports to loopback traffic only
Run GoLand profiling sessions inside isolated virtual machines or containers with no inbound network exposure
Avoid passing secrets, tokens, or credentials as command-line arguments to Go binaries that will be profiled

bash

# Example host firewall rule restricting pprof-range ports to loopback (Linux/iptables)
iptables -A INPUT -p tcp --dport 6060 ! -i lo -j DROP
iptables -A INPUT -p tcp --dport 8080:8090 ! -i lo -j DROP