CVE-2026-67315 in axios
Summary
by MITRE • 08/01/2026
axios versions 1.15.0 before 1.18.0 fail to recognize 0.0.0.0 as a loopback address in shouldBypassProxy.js, allowing requests to 0.0.0.0 to bypass NO_PROXY rules. Attackers can supply 0.0.0.0 URLs to route requests through configured proxies, potentially exposing local services when the proxy can reach the destination.
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Analysis
by VulDB Data Team • 08/01/2026
The vulnerability resides in axios library versions between 1.15.0 and 1.17.9 where the proxy bypass logic contains a critical flaw in loopback address detection. The issue specifically affects the shouldBypassProxy.js module which is responsible for determining whether network requests should be routed through a configured proxy or directly to their destination. When the library encounters a request directed at 0.0.0.0, it fails to properly identify this address as a loopback address according to standard network protocols and RFC specifications.
This technical deficiency stems from improper validation of IP address ranges within the proxy bypass decision-making process. The 0.0.0.0 address represents a special placeholder value that should be treated identically to 127.0.0.1 or localhost for loopback purposes, yet the vulnerable code path does not recognize this equivalence. The flaw essentially creates a bypass mechanism where requests intended to remain local can be inadvertently routed through corporate proxies or external networks, undermining network security policies and isolation measures.
The operational impact of this vulnerability is significant within enterprise environments that rely on proxy configurations for traffic control and security monitoring. When attackers can craft requests directed at 0.0.0.0 addresses, they exploit the proxy bypass mechanism to force traffic through configured proxy servers. This behavior becomes particularly dangerous when the proxy system has access to internal network resources or when it connects to external services that can be leveraged for further attacks. The vulnerability essentially allows for unauthorized tunneling of local network traffic through proxy infrastructure.
The security implications extend beyond simple traffic routing concerns, as this flaw can enable various attack vectors including internal reconnaissance, data exfiltration, and potential exploitation of services that should remain isolated. Network administrators who depend on NO_PROXY configurations to protect sensitive local services from external exposure may find their protection mechanisms circumvented through this vulnerability. The issue directly relates to CWE-284 Access Control Bypass and can be mapped to ATT&CK technique T1071.004 Application Layer Protocol: DNS, as it enables unauthorized network communication patterns that bypass standard security controls.
Organizations should immediately upgrade to axios version 1.18.0 or later where this vulnerability has been addressed through proper loopback address recognition. The fix ensures that 0.0.0.0 is correctly identified and treated as a loopback address, preventing the unintended proxy bypass behavior. Security teams should also review existing proxy configurations and network access controls to verify that similar vulnerabilities do not exist in other components of their infrastructure. Additionally, monitoring systems should be configured to detect unusual proxy usage patterns that might indicate exploitation attempts leveraging this vulnerability.