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CVE-2026-34831

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ada08761ea41dc3b0db9f4efac8a1512936a276c5b34c1f11eb10a7d1c9ee969
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-130","description":"CWE-130: Improper Handling of Length Parameter Inconsistency","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-135","description":"CWE-135: Incorrect Calculation of Multi-Byte String Length","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/problemTypes/1/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:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-130","description":"CWE-130: Improper Handling of Length Parameter Inconsistency","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-135","description":"CWE-135: Incorrect Calculation of Multi-Byte String Length","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/rack/rack/security/advisories/GHSA-q2ww-5357-x388","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rack/rack/security/advisories/GHSA-q2ww-5357-x388"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1dff47042dcd2019f15a955d438c91aff352458fb9a899fc0a1c085d98fa9609 · sha256:582b15a04be3b024… · /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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