{"id":"CVE-2026-21697","state":"PUBLISHED","title":"axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak","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.","publishedAt":"2026-01-07T22:29:57.393Z","updatedAt":"2026-01-08T20:37:17.978Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["rezmoss axios4go"],"affected":[{"vendor":"rezmoss","product":"axios4go","versions":[{"version":"< 0.6.4","status":"affected"}]}],"references":["https://github.com/rezmoss/axios4go/security/advisories/GHSA-cmj9-27wj-7x47","https://github.com/rezmoss/axios4go/commit/b651604c64e66a115ab90cdab358b0181d74a842","https://github.com/rezmoss/axios4go/releases/tag/v0.6.4"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21697.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21697","state":"PUBLISHED","datePublished":"2026-01-07T22:29:57.393Z","dateUpdated":"2026-01-08T20:37:17.978Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-02T18:45:27.397Z"},"containers":{"cna":{"title":"axios4go's Race Condition in Shared HTTP Client Allows Proxy Configuration Leak","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"rezmoss","product":"axios4go","versions":[{"version":"< 0.6.4","status":"affected"}]}],"references":[{"url":"https://github.com/rezmoss/axios4go/security/advisories/GHSA-cmj9-27wj-7x47","name":"https://github.com/rezmoss/axios4go/security/advisories/GHSA-cmj9-27wj-7x47","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rezmoss/axios4go/commit/b651604c64e66a115ab90cdab358b0181d74a842","name":"https://github.com/rezmoss/axios4go/commit/b651604c64e66a115ab90cdab358b0181d74a842","tags":["x_refsource_MISC"]},{"url":"https://github.com/rezmoss/axios4go/releases/tag/v0.6.4","name":"https://github.com/rezmoss/axios4go/releases/tag/v0.6.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-07T22:29:57.393Z"},"source":{"advisory":"GHSA-cmj9-27wj-7x47","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-08T20:37:08.423675Z","id":"CVE-2026-21697","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-08T20:37:17.978Z"}}]}}}