CVE-2026-21697 – axios4go’s Race Condition in Shared HTTP Client Allows Proxy Configuration Leak

CVE ID : CVE-2026-21697

Published : Jan. 7, 2026, 11:15 p.m. | 1 hour, 12 minutes ago

Description : axios4go is a Go HTTP client library. Prior to version 0.6.4, a race condition vulnerability exists in the shared HTTP client configuration. The global `defaultClient` is mutated during request execution without synchronization, directly modifying the shared `http.Client`’s `Transport`, `Timeout`, and `CheckRedirect` properties. Impacted applications include that that use axios4go with concurrent requests (multiple goroutines, `GetAsync`, `PostAsync`, etc.), those where different requests use different proxy configurations, and those that handle sensitive data (authentication credentials, tokens, API keys). Version 0.6.4 fixes this issue.

Severity: 8.2 | HIGH

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