CVE-2026-41186: Unauthenticated Go pprof exposure in Calico debug server

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-30 · updated 2026-08-08
Weakness: CWE-200

Description

When Calico's shared debug server is enabled (disabled by default), the Calico kube-controllers and Goldmane components bind their Go pprof debug listener to 0.0.0.0 without authentication. Any pod with network reachability to the listener can retrieve the process heap, goroutine stacks (including function arguments), and command-line arguments. Depending on the process's in-memory state, the heap may contain sensitive material. The debug listener is opt-in but is unsafe when enabled because it offers no authentication and no safe localhost-only binding option.

Affected products

Tigera Calico: before 3.21.7; before 3.31.6; through 22.4.0; from 3.22.0 before 3.22.4; from 3.32.0 before 3.32.1 — fixed in 3.21.7, 3.22.4, 3.31.6, 3.32.1

How to fix

Upgrade to a fixed version: Tigera Calico 3.21.7, 3.22.4, 3.31.6, 3.32.1. Check the vendor advisory for mitigations.

References

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