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CVE-2026-21697

axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak

8.2 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.41%Up 0.3 points since Jan 8, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak

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.

Record
CVE-2026-21697
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-362
Updated
2026-11-02
EUVDEUVD-2026-1381 8.2

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.

Record
EUVD-2026-1381
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 8.2

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.

Record
CVE-2026-21697
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-362
Updated
2026-11-02
OSV 8.2

axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak

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.

Record
CVE-2026-21697
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-362
Updated
2026-11-02

Affected products

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-21697 is a high vulnerability (CVSS 8.2) in Rezmoss Axios4go, published January 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 35th percentile. No source names a fixed version.

References

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