CVE-2026-32762

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Source
https://cve.org/CVERecord?id=CVE-2026-32762
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-32762.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-32762
Aliases
Downstream
Related
Published
2026-04-02T17:06:50.819Z
Modified
2026-04-06T00:44:19.285799825Z
Severity
  • 4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Rack: Forwarded Header semicolon injection enables Host and Scheme spoofing
Details

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwarded_values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header can be interpreted by Rack as multiple Forwarded directives rather than as a single quoted for value. In deployments where an upstream proxy, WAF, or intermediary validates or preserves quoted Forwarded values differently, this discrepancy can allow an attacker to smuggle host, proto, for, or by parameters through a single header value. This issue has been patched in versions 3.1.21 and 3.2.6.

Database specific 
{
    "cwe_ids": [
        "CWE-436"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32762.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/rack/rack

Affected ranges

Type
GIT
Repo
https://github.com/rack/rack
Events
Introduced
572a42a705b423ce98ef4e81435d4f60fb0ae53d
Fixed
ae8431120e66e92d1885ab8ec0a553d9cad5ec13
Database specific 
{
    "versions": [
        {
            "introduced": "3.0.0.beta1"
        },
        {
            "fixed": "3.1.21"
        }
    ]
}
Type
GIT
Repo
https://github.com/rack/rack
Events
Introduced
b68251c03788ff39d4a4b25424df7360426e4afd
Fixed
e1f22fdbe99afd2126b6fbf05bb12399359574b7
Database specific 
{
    "versions": [
        {
            "introduced": "3.2.0"
        },
        {
            "fixed": "3.2.6"
        }
    ]
}

Affected versions

3.*
3.0.0
3.0.0.beta1
3.0.0.rc1
v3.*
v3.0.1
v3.0.10
v3.0.12
v3.0.13
v3.0.14
v3.0.15
v3.0.16
v3.0.17
v3.0.18
v3.0.2
v3.0.3
v3.0.4
v3.0.4.1
v3.0.4.2
v3.0.5
v3.0.6
v3.0.6.1
v3.0.7
v3.0.8
v3.0.9
v3.0.9.1
v3.1.0
v3.1.1
v3.1.10
v3.1.11
v3.1.12
v3.1.13
v3.1.14
v3.1.15
v3.1.16
v3.1.17
v3.1.18
v3.1.19
v3.1.2
v3.1.20
v3.1.3
v3.1.4
v3.1.5
v3.1.6
v3.1.7
v3.1.8
v3.1.9
v3.2.0
v3.2.1
v3.2.2
v3.2.3
v3.2.4
v3.2.5
v3.2.6

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-32762.json"