Is This vulnerability exploited in the wild?

No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

How severe is This vulnerability?

Medium severity, with a CVSS score of 4.7, published 19 February 2026.

Which products and versions are affected?

github.com/go-chi/chi/v5 (Go) >= 5.2.2, = 5.2.2, < 5.2.4.

Is there a fix for This vulnerability?

A patch was published on 2026-06-18: Advisory updated with patch information and withdrawn as duplicate of GHSA-mqqf-5wvp-8fh8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is This vulnerability attacked?

It is attacked over the network, in a software library.

Check whether you run github.com/go-chi/chi/v5 (Go) or Go-Chi Chi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

go-chi chi open redirect in RedirectSlashes middleware

Q: Is there a fix for This vulnerability?

A patch was published on 2026-06-18: Advisory updated with patch information and withdrawn as duplicate of GHSA-mqqf-5wvp-8fh8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is This vulnerability attacked?

It is attacked over the network, in a software library.

Q: Am I affected?

Check whether you run github.com/go-chi/chi/v5 (Go) or Go-Chi Chi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Severity: medium · CVSS 4.7 · Published 2026-02-19

A vulnerability in the chi web router library could allow attackers to redirect users from a legitimate website to a malicious one. This occurs when the application processes URLs with specific trailing slash patterns. Attackers can use this to facilitate phishing campaigns by making malicious links appear to belong to a trusted domain.

Technologies: github.com/go-chi/chi/v5 (Go), Go-Chi Chi. Vendors: Go, Go-Chi.

Quick answers

Is This vulnerability exploited in the wild?: No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?: Medium severity, with a CVSS score of 4.7, published 19 February 2026.
Which products and versions are affected?: github.com/go-chi/chi/v5 (Go) >= 5.2.2, < 5.2.4; Go-Chi Chi >= 5.2.2, < 5.2.4.
Is there a fix for This vulnerability?: A patch was published on 2026-06-18: Advisory updated with patch information and withdrawn as duplicate of GHSA-mqqf-5wvp-8fh8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is This vulnerability attacked?: It is attacked over the network, in a software library.
Am I affected?: Check whether you run github.com/go-chi/chi/v5 (Go) or Go-Chi Chi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An open redirect vulnerability (CWE-601) exists in the RedirectSlashes middleware of the go-chi/chi library. The root cause is improper validation of user-supplied input within the RedirectSlashes function, which can be manipulated to point to an external domain. A remote, unauthenticated attacker can exploit this by crafting a specific URL that, when processed by the middleware, triggers a redirect to an arbitrary untrusted site. This requires user interaction (clicking a link). The issue is fixed in version 5.2.4.

Affected products

go-chi chi >= 5.2.2, < 5.2.4

Timeline

2026-02-19: disclosed
2026-02-19: advisory
2026-06-18: patched: Advisory updated with patch information and withdrawn as duplicate of GHSA-mqqf-5wvp-8fh8

References

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