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CVE-2020-26259— XStream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling

Quick assessment

Affected
x-stream xstream
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

XStream是XStream（Xstream）团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 1.1.14版本及之前版本操作系统存在操作系统命令注入漏洞。该漏洞可能允许远程攻击者删除主机上的任意已知文件作为日志。

CVSS 6.8 · Medium EPSS 82.39% · P100

Affected Version Matrix 1

VendorProduct Version RangeStatus
x-stream xstream < 1.4.15 affected
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I. Basic Information for CVE-2020-26259

Vulnerability Information
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Vulnerability Title
XStream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling
Source: CVE Program / CVE List V5
Vulnerability Description
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling. The vulnerability may allow a remote attacker to delete arbitrary know files on the host as log as the executing process has sufficient rights only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist running Java 15 or higher. No user is affected, who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
XStream 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XStream是XStream（Xstream）团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 1.1.14版本及之前版本操作系统存在操作系统命令注入漏洞。该漏洞可能允许远程攻击者删除主机上的任意已知文件作为日志。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
x-stream xstream < 1.4.15 -

II. Public POCs for CVE-2020-26259

# POC Description Source Link Shenlong Link
1 CVE-2020-26259: XStream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling as long as the executing process has sufficient rights. https://github.com/jas502n/CVE-2020-26259 POC Details
2 CVE-2020-26259 &&XStream Arbitrary File Delete https://github.com/Al1ex/CVE-2020-26259 POC Details
3 None https://github.com/Threekiii/Awesome-POC/blob/master/%E5%BC%80%E5%8F%91%E6%A1%86%E6%9E%B6%E6%BC%8F%E6%B4%9E/XStream%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E5%88%A0%E9%99%A4%20%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E6%BC%8F%E6%B4%9E%20CVE-2020-26259.md POC Details
4 None https://github.com/cuijiung/xstream-CVE-2020-26259 POC Details
5 None https://github.com/andikahilmy/CVE-2020-26259-xstream-vulnerable POC Details
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III. Intelligence Information for CVE-2020-26259

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Vendor Advisories for CVE-2020-26259 (3)

Mailing List Discussions for CVE-2020-26259 (5)

Security Blog Posts for CVE-2020-26259 (1)

IV. Related Vulnerabilities

Same product: xstream
Same vendor: x-stream
Same weakness: CWE-78

V. Comments for CVE-2020-26259

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