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I. Basic Information for CVE-2025-61921
Vulnerability Information

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Vulnerability Title
Sinatra has ReDoS vulnerability in ETag header value generation
Source: NVD (National Vulnerability Database)
Vulnerability Description
Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response. Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted. Version 4.2.0 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1333
Source: NVD (National Vulnerability Database)
Vulnerability Title
Sinatra 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sinatra是Sinatra开源的一个DSL,用于以最少的努力快速创建Ruby中的web应用程序 Sinatra 4.2.0之前版本存在安全漏洞,该漏洞源于If-Match和If-None-Match标头解析组件存在缺陷,可能导致拒绝服务攻击。
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
VendorProductAffected VersionsCPESubscribe
sinatrasinatra < 4.2.0 -
II. Public POCs for CVE-2025-61921
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III. Intelligence Information for CVE-2025-61921
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