CVE-2026-94445: Malicious user input may lead to RCE in golang.org/x/playground

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-25 · updated 2026-09-29
Weakness: CWE-20

Description

A malicious txtar could escape the intended execution context and force arbitrary writes to the playground host's trusted filesystem. Disjointly, one of the three possible paths to invoke go vet on the playground host did not correctly restrict the execution environment. This permitted a Go process to make a read for an environment configuration file rooted in the playground host's $HOME. Together, a well-crafted go env file and the go vet invocation could lead to remote code execution in the playground host itself. This does not affect users of go.dev/play directly; however, it may affect independent deployments of golang.org/x/playground.

Affected products

golang.org/x/playground: before 0.0.0-20260924211604-6d73cff14c17 — fixed in 0.0.0-20260924211604-6d73cff14c17

How to fix

Upgrade to a fixed version: golang.org/x/playground 0.0.0-20260924211604-6d73cff14c17. Check the vendor advisory for mitigations.

References

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