{"id":"CVE-2026-33176","state":"PUBLISHED","title":"Rails Active Support has a possible DoS vulnerability in its number helpers","description":"Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.","publishedAt":"2026-03-23T23:29:27.933Z","updatedAt":"2026-03-24T18:42:48.858Z","severity":{"score":6.6,"label":"Medium","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["rails activesupport"],"affected":[{"vendor":"rails","product":"activesupport","versions":[{"version":">= 8.1.0.beta1, < 8.1.2.1","status":"affected"},{"version":">= 8.0.0.beta1, < 8.0.4.1","status":"affected"},{"version":"< 7.2.3.1","status":"affected"}]}],"references":["https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9","https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb","https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a","https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856","https://github.com/rails/rails/releases/tag/v7.2.3.1","https://github.com/rails/rails/releases/tag/v8.0.4.1","https://github.com/rails/rails/releases/tag/v8.1.2.1"],"weaknesses":["CWE-400","CWE-770"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33176.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33176","state":"PUBLISHED","datePublished":"2026-03-23T23:29:27.933Z","dateUpdated":"2026-03-24T18:42:48.858Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-17T22:16:36.719Z"},"containers":{"cna":{"title":"Rails Active Support has a possible DoS vulnerability in its number helpers","descriptions":[{"lang":"en","value":"Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch."}],"affected":[{"vendor":"rails","product":"activesupport","versions":[{"version":">= 8.1.0.beta1, < 8.1.2.1","status":"affected"},{"version":">= 8.0.0.beta1, < 8.0.4.1","status":"affected"},{"version":"< 7.2.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9","name":"https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb","name":"https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a","name":"https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856","name":"https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","name":"https://github.com/rails/rails/releases/tag/v7.2.3.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","name":"https://github.com/rails/rails/releases/tag/v8.0.4.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","name":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.6,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-23T23:29:27.933Z"},"source":{"advisory":"GHSA-2j26-frm8-cmj9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-24T18:42:42.653404Z","id":"CVE-2026-33176","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-24T18:42:48.858Z"}}]}}}