CVE-2026-21697 axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak
A race condition in axios4go allows attackers to leak proxy configurations and potentially bypass security controls in concurrent applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21697?
CVE-2026-21697 is a high-severity vulnerability in rezmoss axios4go, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2026-21697?
It affects 1 product.
Products include Rezmoss Axios4go.
How do I fix CVE-2026-21697?
No fix has been published for CVE-2026-21697 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21697 being exploited?
There is no known exploitation of CVE-2026-21697 in the wild and no public exploit code.
Sources
Also known as GHSA-cmj9-27wj-7x47.