CVE-2025-71405
Description
A flaw was found in go-chi/chi. The RedirectSlashes middleware function incorrectly uses the Host header to build redirect URLs. A remote attacker can manipulate the Host header to redirect users to arbitrary malicious websites. This can lead to phishing attacks and credential theft.
Statement
Red Hat rates this issue Moderate. The vulnerable Host-based redirect implementation is present in go-chi/chi v5 releases from v5.0.0 through v5.2.1 and is fixed in v5.2.2. Exploitation requires an application to use the RedirectSlashes middleware and an attacker to submit a request with a manipulated Host header; upstream notes that normal browsers and email clients cannot directly manipulate this header. Red Hat products identified with go-chi/chi v1 or v4 are not affected because that implementation does not construct redirects from the Host header.
Mitigation
Upgrade go-chi/chi to v5.2.2 or later. If an immediate upgrade is not possible, disable the RedirectSlashes middleware or configure the application or frontend proxy to validate and allowlist trusted Host headers.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.4 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
The user may be redirected to an untrusted page that contains malware which may then compromise the user's system. In some cases, an open redirect can also enable the immediate download of a file without the user's permission, because the redirection to an external site may lead to endpoints on those sites that automatically trigger a download action ("drive-by download" [REF-1478]). This will expose the user to extensive risk. The user's interaction with the web server may also be compromised if the malware conducts keylogging or other attacks that steal credentials, personally identifiable information (PII), or other important data.
Access Control,Confidentiality,Other
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity; Other
By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam. The user may be subjected to phishing attacks by being redirected to an untrusted page. The phishing attack may point to an attacker controlled web page that appears to be a trusted web site. The phishers may then steal the user's credentials and then use these credentials to access the legitimate web site. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.
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