CVE-2026-72817

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Source
https://cve.org/CVERecord?id=CVE-2026-72817
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72817.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-72817
Aliases
Downstream
Published
2026-08-14T11:35:28.824Z
Modified
2026-08-18T03:31:19.417843866Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
Details

go-chi/chi versions 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72817.json"
}
References

Affected packages

Git / github.com/go-chi/chi

Affected ranges

Type
GIT
Repo
https://github.com/go-chi/chi
Events
Introduced
c420d7fbf4428b27e31d83591e5e2267d84f9f20
Fixed
3b171578ca44dfd75ca3c5cbddc7b44c600a7b49
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.9.0"
        },
        {
            "fixed": "5.3.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v0.*
v0.9.0
v1.*
v1.0.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v2.*
v2.0.0
v2.1.0
v3.*
v3.0.0
v3.1.0
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.1.5
v3.2.0
v3.2.1
v3.3.0
v3.3.1
v3.3.2
v3.3.3
v3.3.4
v4.*
v4.0.0
v4.0.1
v4.0.2
v4.0.3
v4.0.4
v4.1.0
v4.1.1
v4.1.2
v5.*
v5.0.0
v5.0.1
v5.0.10
v5.0.11
v5.0.12
v5.0.13
v5.0.14
v5.0.2
v5.0.3
v5.0.4
v5.0.5
v5.0.6
v5.0.7
v5.0.8
v5.0.9
v5.1.0
v5.2.0
v5.2.1
v5.2.2
v5.2.3
v5.2.4
v5.2.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72817.json"