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TI-2026-82197 Aliases CVE-2026-118656GHSA-v753-g4cw-jm48

Open redirect in Echo Go framework via control-character prefix

Priority LOW 27CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

The labstack echo Go web framework is affected from 5.0.0 before 5.4.0 and before 4.16.0. The sanitizeURI function checks only the first two bytes of a redirect target, so a leading control character lets a redirect path evade the check (CWE-601). When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a remote attacker can make a user's browser follow the Location header to an attacker-controlled host, but this requires user interaction.

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

Description from the CNA

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00197 9th percentileScored 2026-11-07
Fix Fixed echo (labstack): 5.4.0, 4.16.0github.com/labstack/echo/v5 (Go): 5.4.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
labstackecho5.0.0 to before 5.4.0; before 4.16.05.4.0, 4.16.0Patch availableCNA
—github.com/labstack/echo/v5 (Go)before 5.4.05.4.0Patch availableGHSA-v753-g4cw-jm48
—github.com/labstack/echo/v4 (Go)before 4.16.04.16.0Patch availableGHSA-v753-g4cw-jm48
  • echo Vendorlabstack Affected 5.0.0 to before 5.4.0; before 4.16.0 Fixed in 5.4.0, 4.16.0 Patch available CNA
  • github.com/labstack/echo/v5 (Go) Vendor— Affected before 5.4.0 Fixed in 5.4.0 Patch available GHSA-v753-g4cw-jm48
  • github.com/labstack/echo/v4 (Go) Vendor— Affected before 4.16.0 Fixed in 4.16.0 Patch available GHSA-v753-g4cw-jm48

Remediation

Fixed versions are 4.16.0 for github.com/labstack/echo/v4 and 5.4.0 for github.com/labstack/echo/v5. Upgrade to these or later versions.

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

  • Fix · CNA echo (labstack) Fixed in 5.4.0, 4.16.0
  • Fix · GHSA-v753-g4cw-jm48 github.com/labstack/echo/v5 (Go) Fixed in 5.4.0 Advisory →
  • Fix · GHSA-v753-g4cw-jm48 github.com/labstack/echo/v4 (Go) Fixed in 4.16.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118656
  2. 2026-10-28 Alias added: GHSA-v753-g4cw-jm48
  3. 2026-10-28 Fix available: Go/github.com/labstack/echo/[email protected], Go/github.com/labstack/echo/[email protected] · GHSA-v753-g4cw-jm48
  4. 2026-10-28 CVSS score added · GHSA-v753-g4cw-jm48
  5. 2026-10-28 Weakness changed · GHSA-v753-g4cw-jm48
  6. 2026-10-28 6 new references · GHSA-v753-g4cw-jm48
  7. 2026-10-29 CISA SSVC decision points changed
  8. 2026-10-29 Priority changed: MEDIUM → LOW
  9. 2026-11-06 Affected versions changed · Red Hat
  10. 2026-11-06 CVSS score added · Red Hat

References

Other 6

  • TI-2022-18981 Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the… CVSS 3.1CRITICAL 9.6
  • TI-2026-82185 Path decoding mismatch in Echo middleware.Static exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-40198 Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files CVSS 3.1HIGH 7.5
  • TI-2026-82194 Rate limiter bypass in Echo via spoofed X-Forwarded-For header CVSS 3.1MEDIUM 5.3
  • TI-2026-20833 Echo has a Windows path traversal via backslash in middleware.Static default filesystem CVSS 3.1MEDIUM 5.3
  • TI-2020-18793 Directory traversal on Windows in github.com/labstack/echo/v4 CVSS 3.1MEDIUM 5.3
See all 19 →

Sources

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