CVE-2026-67319 axios before 0.33.0 Prototype Pollution via nested option objects
Attackers can inject credentials or alter query serialization in axios if prototype pollution exists elsewhere, requiring an upgrade to secure versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67319?
CVE-2026-67319 is a medium-severity unsafe deserialization vulnerability in axios, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
axios before 0.33.0 (and 1.x before 1.18.0) can consume inherited properties from nested request option objects when the JavaScript process's Object.prototype has already been polluted by another component. While the top-level merged config uses a null prototype, nested plain objects such as auth and paramsSerializer are cloned into ordinary objects and read without own-property checks. When an application passes placeholder nested objects such as auth: {} or paramsSerializer: {}, inherited username/password values can cause silent injection of an Authorization: Basic header, and inherited encode/serialize values can alter query-string serialization (full serializer replacement requires a function-valued pollution primitive). This is exploitable only in the presence of pre-existing prototype pollution.
Weakness: CWE-1321
Which versions are affected by CVE-2026-67319?
4 open source packages ship an affected version, including axios. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
axios npm | From 0.8.0 | 0.33.0 |
axios npm | From 0.8.0 | 0.33.0 |
axios npm | From 1.0.0 | 1.18.0 |
axios npm | From 1.0.0 | 1.18.0 |
Products include Axios Axios.
How do I fix CVE-2026-67319?
Upgrade axios to a fixed version for your release line: 0.33.0 or 1.18.0.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-67319 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67319 exists.
Other vulnerabilities in axios
- CVE-2026-44494 Axios: Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`
- CVE-2026-44492 axios's shouldBypassProxy does not recognize IPv4-mapped IPv6 addresses, allowing NO_PROXY bypass (incomplete fix for CVE-2025-62718)
- CVE-2026-67320 axios before 0.33.0 Prototype Pollution via Node HTTP adapter
- CVE-2026-44487 Axios: Proxy-Authorization Credential Leak to Origin Server Across HTTP-to-HTTPS Redirect in Axios Node.js HTTP Adapter
- CVE-2025-27152 Possible SSRF and Credential Leakage via Absolute URL in axios Requests
Sources
Also known as CLEANSTART-2026-EZ79876, CLSA-2026-1787841237, CVE-2026-69123, DEBIAN-CVE-2026-67319, ECHO-1225-9205-2453, GHSA-7q8q-rj6j-mhjq and 28 more.