CVE-2026-21697

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductRezmoss Axios4go

PublishedJan 7, 2026

First seenJan 7, 2026

Weakness typeCWE-362Race condition

How to fix

Update

rezmoss axios4go0.6.4 or later

Affected products

Product	Affected versions	Fixed in
rezmoss axios4go	v < 0.6.4	0.6.4

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