Axios NO_PROXY bypass via IPv4-mapped IPv6 addresses
CVE-2026-44492 is a proxy-bypass vulnerability in Axios, the promise-based HTTP client for browsers and Node.js. In vulnerable versions prior to 0.32.0 and 1.16.0, Axios's proxy bypass logic does not normalize IPv4-mapped IPv6 addresses before evaluating NO_PROXY exclusions. As a result, when NO_PROXY contains IPv4 literals such as 127.0.0.1 or 169.254.169.254, an attacker can supply the equivalent IPv4-mapped IPv6 form, such as ::ffff:7f00:1 or ::ffff:a9fe:a9fe, and Axios will fail to recognize that the destination should bypass the proxy. In Node.js, these mapped addresses are resolved to the underlying IPv4 host, so the request is still sent to the intended internal destination, but through the configured proxy path. The issue is described as an incomplete fix related to prior proxy-bypass handling and can expose internal-only services or metadata endpoints to SSRF-style access.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Axios vulnerability involving improper handling of IPv4-mapped IPv6 addresses, allowing NO_PROXY restrictions to be bypassed so requests to internal IPv4 hosts can still be sent through a configured proxy.
An Axios proxy bypass vulnerability caused by improper normalization of IPv4-mapped IPv6 addresses in shouldBypassProxy, allowing malicious URLs to bypass proxy exclusion rules and potentially access internal resources such as cloud metadata endpoints.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.