CVE-2026-33176— Rails Active Support has a possible DoS vulnerability in its number helpers
Quick assessment
Affected
rails activesupport
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails Active Support 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于数字辅助函数接受包含科学计数法的字符串，可能导致内存和CPU消耗过大引发拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-33176
Vulnerability Information
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Vulnerability Title
Rails Active Support has a possible DoS vulnerability in its number helpers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Rails 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails Active Support 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于数字辅助函数接受包含科学计数法的字符串，可能导致内存和CPU消耗过大引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rails | activesupport | >= 8.1.0.beta1, < 8.1.2.1 | - |
|
II. Public POCs for CVE-2026-33176
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-33176 (4)
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Release 7.2.3.1 · rails/rails · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-33176 (1)
Vendor Pages for CVE-2026-33176 (2)
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Release 8.1.2.1 · rails/rails · GitHub x_refsource_MISC
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Release 8.0.4.1 · rails/rails · GitHub x_refsource_MISC
Same Patch Batch · rails · 2026-03-23 · 9 CVEs total
| CVE-2026-33195 | 8.0 HIGH | Rails Active Storage has possible Path Traversal in DiskService |
| CVE-2026-33167 | Rails has a possible XSS vulnerability in its Action Pack debug exceptions | |
| CVE-2026-33168 | Rails has a possible XSS vulnerability in its Action View tag helpers | |
| CVE-2026-33170 | Rails Active Support has a possible XSS vulnerability in SafeBuffer#% | |
| CVE-2026-33173 | Rails Active Storage has possible content type bypass via metadata in direct uploads | |
| CVE-2026-33174 | Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range request | |
| CVE-2026-33169 | Rails Active Support has a possible ReDoS vulnerability in number_to_delimited | |
| CVE-2026-33202 | Rails Active Storage has possible glob injection in its DiskService |
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V. Comments for CVE-2026-33176
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