Vulnerability in Rezmoss Axios4go
CVE-2026-21697
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Rezmoss Axios4go — versions < 0.6.4
Weakness classification (CWE)
References
- github.com/rezmoss/axios4go/security/advisories/GHSA-cmj9-27wj-7x47 (Mitigation, Vendor Advisory)
- github.com/rezmoss/axios4go/commit/b651604c64e66a115ab90cdab358b0181d74a842 (Patch)
- github.com/rezmoss/axios4go/releases/tag/v0.6.4 (Product)
Frequently asked questions
- What is CVE-2026-21697?
- CVE-2026-21697 is a high-severity vulnerability in Rezmoss Axios4go, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2026-01-07.
- How severe is CVE-2026-21697?
- High severity. CVSS v3 base score is 8.1 out of 10.