CVE-2025-59830

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-59830
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-59830.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-59830
Aliases
Downstream
Related
Published
2025-09-25T14:37:06.967Z
Modified
2026-07-11T03:53:25.271506963Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters
Details

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.

Database specific 
{
    "cwe_ids": [
        "CWE-400",
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/59xxx/CVE-2025-59830.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
0 Unknown introduced commit / All previous commits are affected
Fixed
0f76d43c0d5624bd0d325df4f0a63f5e1faa7254
Fixed
54e4ffdd5affebcb0c015cc6ae74635c0831ed71
Database specific 
{
    "cpe": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.2.18"
        }
    ]
}

Affected versions

0.*
0.1
0.2
0.3
1.*
1.0
1.3.0
1.3.0.beta
1.3.0.beta2
1.4.0
1.4.1
1.5.0
1.5.1
1.6.0.beta
2.*
2.0.0
2.0.0.alpha
2.0.0.rc1
2.0.1
2.1.0
2.2.0
2.2.3
2.2.4
v2.*
v2.2.1
v2.2.10
v2.2.11
v2.2.12
v2.2.13
v2.2.14
v2.2.15
v2.2.16
v2.2.17
v2.2.2
v2.2.5
v2.2.6
v2.2.6.1
v2.2.6.2
v2.2.7
v2.2.8
v2.2.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-59830.json"