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CVE-2026-33658

Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4baa033371cd23d5ef64f0b27e012a9e2e67d2f5ee0a129e709db7d9b3b50853
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"activestorage","vendor":"rails","versions":[{"status":"affected","version":">= 8.1.0, < 8.1.2.1"},{"status":"affected","version":">= 8.0.0, < 8.0.4.1"},{"status":"affected","version":"< 7.2.3.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/rails/rails/releases/tag/v7.2.3.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/references/1
{"name":"https://github.com/rails/rails/releases/tag/v8.0.4.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/references/2
{"name":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/references/3
{"name":"https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/references/0
{"name":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml","tags":["x_refsource_MISC"],"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33658.yml"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:935ec5d4742faa9a83d50ba87ad59578f99e202f6ce182c86b6a83067d187ece · sha256:c2c4f9c7997dab2f… · /containers/cna/references/4

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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