Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
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| rack | rack | affected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions |
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| Rack | Rack | — |
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4357-1 | ruby-rack security update |
Debian DSA |
DSA-6048-1 | ruby-rack security update |
Github GHSA |
GHSA-wpv5-97wm-hp9c | Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion) |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.930% probability within 30 days)
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| CPEs | cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:* |
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| First Time appeared |
Rack
Rack rack |
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| Vendors & Products |
Rack
Rack rack |
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| References |
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| Metrics |
threat_severity
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threat_severity
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| Metrics |
ssvc
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| Description | Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx `client_max_body_size`). | |
| Title | Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion) | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV3_1
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