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CVE-2024-55875— http4k has a potential XXE (XML External Entity Injection) vulnerability

Quick assessment

Affected
http4k http4k
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.

http4k是http4k开源的一个轻量级但功能齐全的 HTTP 工具包。 http4k 5.41.0.0之前版本存在代码问题漏洞，该漏洞源于在处理请求中的恶意XML内容时存在潜在的XML外部实体注入漏洞，可能允许攻击者读取服务器上的本地敏感信息，触发服务器端请求伪造，甚至在某些情况下执行代码。

CVSS 9.8 · Critical EPSS 1.91% · P80

Affected Version Matrix 1

VendorProduct Version RangeStatus
http4k http4k < 6.50.0.0 affected
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I. Basic Information for CVE-2024-55875

Vulnerability Information
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Vulnerability Title
http4k has a potential XXE (XML External Entity Injection) vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
http4k is a functional toolkit for Kotlin HTTP applications. Prior to version 6.50.0.0, there is a potential XXE (XML External Entity Injection) vulnerability when http4k handling malicious XML contents within requests, which might allow attackers to read local sensitive information on server, trigger Server-side Request Forgery and even execute code under some circumstances. The original fix shipped in v5.41.0.0 / v4.50.0.0 closed the documented external-entity attack class (SSRF, local-file disclosure, code execution) by setting `ACCESS_EXTERNAL_DTD=""`, `ACCESS_EXTERNAL_SCHEMA=""`, and `isExpandEntityReferences=false` on the default `DocumentBuilderFactory`. A residual gap remained: the parser still accepted documents containing `<!DOCTYPE>` declarations even though external entity resolution was blocked. This left open billion-laughs-style internal entity expansion DoS attacks against any application using `Body.xml()` or `Document.asXmlDocument()` on untrusted XML. v6.50.0.0 closes this residual by adding `disallow-doctype-decl=true` and `FEATURE_SECURE_PROCESSING=true` to `defaultXmlParsingConfig`. Any document containing a `<!DOCTYPE>` is now rejected at parse time.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
http4k 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
http4k是http4k开源的一个轻量级但功能齐全的 HTTP 工具包。 http4k 5.41.0.0之前版本存在代码问题漏洞，该漏洞源于在处理请求中的恶意XML内容时存在潜在的XML外部实体注入漏洞，可能允许攻击者读取服务器上的本地敏感信息，触发服务器端请求伪造，甚至在某些情况下执行代码。
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
http4k http4k < 6.50.0.0 -

II. Public POCs for CVE-2024-55875

# POC Description Source Link Shenlong Link
1 CVE-2024-55875 | GHSA-7mj5-hjjj-8rgw | http4k first CVE https://github.com/JAckLosingHeart/CVE-2024-55875 POC Details
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Qwen3.6-35B-A3B · 8380 chars
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III. Intelligence Information for CVE-2024-55875

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Patches & Fixes for CVE-2024-55875 (2)

Vendor Advisories for CVE-2024-55875 (1)

IV. Related Vulnerabilities

Same product: http4k
Same vendor: http4k
Same weakness: CWE-200