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CVE-2026-61741— http4s-scala-xml has an XML External Entity (XXE) processing issue

Quick assessment

Affected
http4s http4s-scala-xml
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.

http4s-scala-xml 提供了用于解析 XML 消息体的 实例。在 0.24.1 和 1.0.0-M39 版本之前，这些解码器通过调用 获取一个 实例，且未进行任何安全配置。在 JDK 的默认设置下，该解析器会处理 DOCTYPE 声明、外部通用实体和参数实体，以及外部 DTD（文档类型定义）。如果应用程序使用这些解码器来解析不受信任的 XML 数据，则容易受到 XML 外部实体（XXE）攻击。攻击者可以构造恶意请求，泄露服务进程可读的本地文件，对内部网络资源执行服务器端请求伪造（SSRF），并通过实体扩

CVSS 9.3 · Critical EPSS 0.29% · P20
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I. Basic Information for CVE-2026-61741

Vulnerability Information
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Vulnerability Title
http4s-scala-xml has an XML External Entity (XXE) processing issue
Source: CVE Program / CVE List V5
Vulnerability Description
http4s-scala-xml provides `EntityDecoder[F, scala.xml.Elem]` instances that parse XML message bodies. Prior to versions 0.24.1 and 1.0.0-M39, these decoders used a `javax.xml.parsers.SAXParserFactory` obtained from `SAXParserFactory.newInstance` without any security configuration. With the JDK's default settings, the parser resolves DOCTYPE declarations, external general and parameter entities, and external DTDs.An application that uses these decoders to parse untrusted XML is vulnerable to XML External Entity (XXE) attacks. An attacker can craft a request that discloses local files readable by the service process, performs server-side request forgery (SSRF) against internal network resources, and/or causes denial of service through entity expansion. Versions 0.24.1 and 1.0.0-M39 fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
http4s http4s-scala-xml < 0.24.1 -

II. Public POCs for CVE-2026-61741

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III. Intelligence Information for CVE-2026-61741

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Other References for CVE-2026-61741 (1)

IV. Related Vulnerabilities

Same vendor: http4s
Same weakness: CWE-611

V. Comments for CVE-2026-61741

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