CVE-2025-71405 go-chi CVE debrief

Who should care

Defenders responsible for the chi framework, security teams, and developers using the chi framework should be aware of this vulnerability and take necessary actions to prevent potential phishing attacks and credential theft.

Why it matters

CVE-2025-71405 is an open redirect vulnerability in the chi framework that allows attackers to redirect users to arbitrary hosts, potentially enabling phishing attacks and credential theft. Defenders should prioritize verifying the vulnerability in their inventory and applying the patch or mitigation to prevent potential phishing attacks.

• Phishing attacks may be enabled by exploiting this vulnerability.
• Credential theft attempts may occur due to the open redirect vulnerability.
• Verification of the vulnerability in inventory and application of patches or mitigations is necessary.
• Security policies and procedures should be reviewed and updated to address open redirect vulnerabilities.

Technical summary

The chi framework's RedirectSlashes middleware function uses the Host header to construct redirect URLs, allowing attackers to manipulate the Host header and redirect users to arbitrary hosts. This vulnerability affects chi versions before v5.2.2 and has a CVSS score of 5.1. Defenders should prioritize verifying the vulnerability in their inventory and applying the patch or mitigation to prevent potential phishing attacks and credential theft attempts. The vulnerability can be exploited by manipulating the Host header, enabling attackers to redirect users to malicious sites, potentially leading to phishing attacks and credential theft.

Defensive priority

Defenders should prioritize verifying the vulnerability in their inventory and applying the patch or mitigation to prevent potential phishing attacks.

Recommended defensive actions

• Verify the chi framework version in your inventory and apply the patch or mitigation if necessary.
• Monitor for potential phishing attacks and credential theft attempts.
• Review and update your security policies and procedures to address open redirect vulnerabilities.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, but the scope of affected versions and deployments requires verification. The vendor's canonical source is not identified, and the confidence in the vendor information is low.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.