CVE-2026-42033 Axios: Prototype Pollution Gadgets - Response Tampering, Data Exfiltration, and Request Hijacking
Attackers can tamper with responses or hijack requests if prototype pollution exists, exposing credentials and modifying data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42033?
CVE-2026-42033 is a high-severity unsafe deserialization vulnerability in axios, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, when Object.prototype has been polluted by any co-dependency with keys that axios reads without a hasOwnProperty guard, an attacker can (a) silently intercept and modify every JSON response before the application sees it, or (b) fully hijack the underlying HTTP transport, gaining access to request credentials, headers, and body. The precondition is prototype pollution from a separate source in the same process. This vulnerability is fixed in 1.15.1 and 0.31.1.
Which versions are affected by CVE-2026-42033?
4 open source packages ship an affected version, including axios. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
axios npm | All versions | 0.31.1 |
axios npm | All versions | 0.31.1 |
axios npm | From 1.0.0 | 1.15.1 |
axios npm | From 1.0.0 | 1.15.1 |
Products include Axios Axios.
How do I fix CVE-2026-42033?
Upgrade axios to a fixed version for your release line: 0.31.1 or 1.15.1.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-42033 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42033 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-NG59834, CLEANSTART-2026-RW51509, DEBIAN-CVE-2026-42033, ECHO-cddf-3336-1340, GHSA-pf86-5x62-jrwf, MINI-33v5-rx48-6v7q and 20 more.