{"id":"CVE-2026-33174","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-33174","generatedAt":"2026-10-28T02:11:13.364Z","title":"Active Storage allows users to attach cloud and local files in Rails applications.","description":"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, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.","published":"2026-03-24T00:16:29.000Z","lastModified":"2026-06-17T10:37:05.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.6,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-789"],"affected":["rubyonrails/rails"],"epss":{"score":0.00621,"percentile":0.49496,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.62%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-33174","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}