Rack: Quadratic complexity in Rack::Utils.select_best_encoding via wildcard Accept-Encoding header
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| rack | rack | affected |
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Configuration 1 [-]
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| Rack | Rack |
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| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4706-1 | ruby-rack security update |
Debian DSA |
DSA-6492-1 | ruby-rack security update |
Github GHSA |
GHSA-v569-hp3g-36wr | Rack has quadratic complexity in Rack::Utils.select_best_encoding via wildcard Accept-Encoding header |
Ubuntu USN |
USN-8182-1 | Rack vulnerabilities |
Ubuntu USN |
USN-8989-1 | Rack vulnerabilities |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.447% probability within 30 days)
| Type | Values Removed | Values Added |
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| CPEs | cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:* |
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| Weaknesses | CWE-1050 | |
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| Metrics |
threat_severity
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threat_severity
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| Metrics |
ssvc
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| First Time appeared |
Rack
Rack rack |
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| Vendors & Products |
Rack
Rack rack |
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| Description | Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.select_best_encoding processes Accept-Encoding values with quadratic time complexity when the header contains many wildcard (*) entries. Because this method is used by Rack::Deflater to choose a response encoding, an unauthenticated attacker can send a single request with a crafted Accept-Encoding header and cause disproportionate CPU consumption on the compression middleware path. This results in a denial of service condition for applications using Rack::Deflater. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6. | |
| Title | Rack: Quadratic complexity in Rack::Utils.select_best_encoding via wildcard Accept-Encoding header | |
| Weaknesses | CWE-400 CWE-407 |
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| References |
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| Metrics |
cvssV3_1
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