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TI-2026-85173 Aliases CVE-2026-122132GHSA-27h9-x5w9-37mx

Open redirect in go-chi chi RedirectSlashes middleware

Priority MEDIUM 56CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.

Summary

go-chi chi from 5.2.2 through 5.5.0 contains an open redirect in the RedirectSlashes middleware (CWE-601). An attacker can craft a link with a URL-encoded tab in the request path, which browsers strip from the 301 Location header and resolve as a protocol-relative URL, redirecting victims who follow it to external hosts. The flaw bypasses the fix for CVE-2025-69725.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00269 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
go-chichi5.2.2 – 5.5.0—No fix listedCNA
  • chi Vendorgo-chi Affected 5.2.2 – 5.5.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for go-chi chi.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-122132
  2. 2026-11-04 Alias added: GHSA-27h9-x5w9-37mx
  3. 2026-11-05 CISA SSVC decision points changed
  4. 2026-11-05 Priority changed: LOW → MEDIUM
  5. 2026-11-06 Affected versions changed · Red Hat
  6. 2026-11-06 CVSS score added · Red Hat

References

Patch 1

Advisory 1

Other 2

  • TI-2026-51042 go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware CVSS 4.0MEDIUM 6.9
  • TI-2026-51041 go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header CVSS 4.0MEDIUM 6.9
  • TI-2026-82170 Authentication bypass in go-chi chi SupressNotFound middleware CVSS 4.0MEDIUM 6.3
  • TI-2026-78796 Client IP spoofing in Go chi ClientIPFromXFF middleware CVSS 4.0MEDIUM 6.3
  • TI-2025-43521 go-chi chi before v5.2.2 Open Redirect via RedirectSlashes CVSS 4.0MEDIUM 5.1
  • TI-2026-51043 go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences