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CVE-2026-34230

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4560449cc030c3c055515e3ebfbe77e0d2d8ce58f398ce1a60ad09dcdf40c162
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"rack","vendor":"rack","versions":[{"status":"affected","version":"< 2.2.23"},{"status":"affected","version":">= 3.0.0.beta1, < 3.1.21"},{"status":"affected","version":">= 3.2.0, < 3.2.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/rack/rack/security/advisories/GHSA-v569-hp3g-36wr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rack/rack/security/advisories/GHSA-v569-hp3g-36wr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ad61a8b9269d55b13289f5b308c951bce8c64e5b222560a9f048fed9fb474935 · sha256:dc692e6bce21ef75… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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