CVE-2026-101906
Description
A flaw was found in axios. A remote attacker operating a malicious server can cause a Denial of Service (DoS) by returning an HTTP redirect containing a crafted hostname. When proxy bypass settings are configured, the application processes the hostname with an inefficient regular expression that consumes excessive computational time. This processing blocks the application's execution thread, leaving the service unresponsive to other requests.
Statement
This vulnerability is rated as having an Important severity because an unauthenticated remote web server can induce sustained event-loop starvation in server-side Node.js applications without requiring credentials or user interaction. The high availability impact stems from synchronous backtracking during proxy bypass checks, which freezes the single-threaded execution thread and denies service to concurrent operations across dependent services. However, exploitation requires specific deployment conditions: proxy settings must be defined with active exclusion rules while the application automatically follows redirects to untrusted targets.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Attackers can create crafted inputs that intentionally cause the regular expression to use excessive backtracking in a way that causes the CPU consumption to spike.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
