Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M

CVE-2026-101906Axios: ReDoS (O(N²)) in shouldBypassProxy host normalization, reachable via untrusted redirect Location

High 8.2

In plain English

A high-severity uncontrolled resource consumption in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.5%top 60.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Axios is a promise-based HTTP client for the browser and Node.js. From 1.15.0 until 1.20.0, Axios shouldBypassProxy applies a quadratic trailing-dot regular expression to redirect hostnames. HTTP_PROXY or HTTPS_PROXY is configured, NO_PROXY or no_proxy is non-empty, redirects are followed, and a crafted redirect Location contains many dots followed by a non-dot character. Hostname.replace(/.+$/, '') backtracks quadratically while processing the crafted redirect hostname. Synchronous regular-expression processing can block the Node.js event loop and cause denial of service. This issue is fixed in version 1.20.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	node-axios	no fix listed	DEBIAN-CVE-2026-101906
Debian:14	node-axios	1.20.0-1	DEBIAN-CVE-2026-101906
Ubuntu:26.10	node-axios	no fix listed	UBUNTU-CVE-2026-101906
npm	axios	1.20.0	GHSA-mghh-pgcx-3jjj

Affected products (as reported)

Vendor	Product	Versions
axios	axios	>= 1.15.0, < 1.20.0

Weakness: CWE-400, CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/axios/axios/security/advisories/GHSA-mghh-pgcx-3jjj x_refsource_CONFIRM
https://github.com/axios/axios/pull/11141 x_refsource_MISC
https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a x_refsource_MISC
https://github.com/axios/axios/releases/tag/v1.20.0 x_refsource_MISC