What’s Vulnerable › Vulnerabilities

CVE-2026-101904: Axios: Header Injection via Inherited headers After Minimal Interceptor

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-74

Description

Axios is a promise-based HTTP client for the browser and Node.js. From 1.0.0 until 1.20.0, the dispatchRequest function normalizes inherited Object.prototype.headers from a replacement request configuration. A separate same-process prototype-pollution flaw sets Object.prototype.headers, and trusted request interceptors return a new ordinary configuration without an own headers property. After the interceptor chain, dispatchRequest resolves the inherited headers during normalization. Downstream request processing can observe attacker-controlled headers, including authorization-related values. This issue is fixed in version 1.20.0.

Affected products

• axios: from 1.0.0, < 1.20.0

References

• https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
• https://github.com/axios/axios/pull/11141
• https://github.com/axios/axios/releases/tag/v1.20.0
• https://github.com/axios/axios/security/advisories/GHSA-j8rh-479h-cp32
• https://github.com/axios/axios/security/advisories/GHSA-j8rh-479h-cp32

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