CVE-2020-26256— Denial of service in fast-csv
Quick assessment
Affected
C2FO fast-csv
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.
C2FO Fast-csv是美国Packwood（C2FO）公司的一个基于Typescript的用于解析和格式化CSV格式文件的代码库。 Fast-csv 存在安全漏洞，该漏洞源于解析时使用ignoreEmpty选项可能存在重dos漏洞(正则表达式拒绝服务)。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2020-26256
Vulnerability Information
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Vulnerability Title
Denial of service in fast-csv
Source: CVE Program / CVE List V5
Vulnerability Description
Fast-csv is an npm package for parsing and formatting CSVs or any other delimited value file in node. In fast-cvs before version 4.3.6 there is a possible ReDoS vulnerability (Regular Expression Denial of Service) when using ignoreEmpty option when parsing. This has been patched in `v4.3.6` You will only be affected by this if you use the `ignoreEmpty` parsing option. If you do use this option it is recommended that you upgrade to the latest version `v4.3.6` This vulnerability was found using a CodeQL query which identified `EMPTY_ROW_REGEXP` regular expression as vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
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
C2FO Fast-csv 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
C2FO Fast-csv是美国Packwood（C2FO）公司的一个基于Typescript的用于解析和格式化CSV格式文件的代码库。 Fast-csv 存在安全漏洞，该漏洞源于解析时使用ignoreEmpty选项可能存在重dos漏洞(正则表达式拒绝服务)。
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
II. Public POCs for CVE-2020-26256
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Patches & Fixes for CVE-2020-26256 (1)
Vendor Advisories for CVE-2020-26256 (1)
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https://github.com/C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp x_refsource_CONFIRM
Other References for CVE-2020-26256 (4)
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https://www.npmjs.com/package/fast-csv x_refsource_MISC
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https://github.com/C2FO/fast-csv/issues/540 x_refsource_MISC
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https://www.npmjs.com/package/%40fast-csv/parse x_refsource_MISC
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https://lgtm.com/query/8609731774537641779/ x_refsource_MISC
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V. Comments for CVE-2020-26256
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