# CVE-2026-122132: go-chi chi 5.2.2 through 5.5.0 Open Redirect via RedirectSlashes Middleware

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

go-chi chi 5.2.2 through 5.5.0 contains an open redirect vulnerability in the RedirectSlashes middleware that allows attackers to redirect victims to external hosts by embedding tab characters in request paths. Attackers can craft links with a URL-encoded tab, which browsers strip from the 301 Location header and resolve as a protocol-relative URL, bypassing the fix for CVE-2025-69725.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/go-chi/chi/pull/1238

## Affected products and versions

- go-chi / chi (github.com/go-chi/chi/v5): ≥ 5.2.2; ≤ 5.5.0 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.1 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-601

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/go-chi/chi/pull/1238 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/go-chi/chi (CNA: VulnCheck; product)

- https://github.com/go-chi/chi/security/advisories/GHSA-mqqf-5wvp-8fh8 (CNA: VulnCheck; related, vendor-advisory)

- https://github.com/go-chi/chi/blob/v5.5.0/middleware/strip.go#L41-L69 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/go-chi-chi-5.2.2-through-5.5.0-open-redirect-via-redirectslashes-middleware (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122132; retrieved 2026-11-04; source updated 2026-11-04

Revision: bf80cfcd503a858c8113810768129d4fce438d3156d40df9a475ba67fbc3ca81

Canonical: https://y2.dev/cve/CVE-2026-122132

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