axios before 0.33.0 Prototype Pollution via Node HTTP adapter

Description

axios in a Node.js deployment using the HTTP adapter can route requests through an attacker-controlled proxy. axios hardens merged request configuration by creating a null-prototype object, but request interceptors run after the merge; a common immutable interceptor pattern such as {...config} or Object.assign({}, config) converts the hardened config back into a regular object. axios then dispatches that object without re-hardening it, and the Node HTTP adapter reads config.proxy through the prototype chain. If an attacker can pollute Object.prototype.proxy, affected requests can be routed through an attacker-controlled proxy. For plaintext HTTP requests, the proxy can observe Authorization headers, Basic auth from config.auth, method, absolute URL, Host, and request body, and can return its own response. This does not establish browser impact or HTTPS header/body disclosure under normal TLS validation. Affected versions are >=0.31.1 (fixed in 0.33.0) and >=1.15.2 (fixed in 1.18.0).

Scores

EPSS (exploitation in 30 days)

0.52% · top 55% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.3.

Weakness

• CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (opens in a new tab)All about CWE-200 and its CVEs

Affected products

• axios · axios

  • affected 0.31.1 – < 0.33.0
  • unaffected 0.33.0

• axios · axios

  • affected 1.15.2 – < 1.18.0
  • unaffected 1.18.0

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• npmaxiosGHSA-gcfj-64vw-6mp9 (opens in a new tab)

References (3)

• GitHub Security Advisory (GHSA-gcfj-64vw-6mp9) (opens in a new tab)vendor-advisory
• Patch Commit (opens in a new tab)patch
• VulnCheck Advisory: axios before 0.33.0 Prototype Pollution via Node HTTP adapter (opens in a new tab)third-party-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-gcfj-64vw-6mp9 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-67320](https://trackcve.app/badge/CVE-2026-67320.svg)](https://trackcve.app/cve/CVE-2026-67320)

Record last updated 3 Aug 2026, 15:38 UTC.