http4s http4s-scala-xml up to 0.24.0/1.0.0-M38 EntityDecoder xml external entity reference

Summaryinfo

A vulnerability categorized as critical has been discovered in http4s http4s-scala-xml up to 0.24.0/1.0.0-M38. This impacts an unknown function of the component EntityDecoder. The manipulation results in xml external entity reference. This vulnerability is cataloged as CVE-2026-61741. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in http4s http4s-scala-xml up to 0.24.0/1.0.0-M38. It has been classified as critical. Affected is an unknown functionality of the component EntityDecoder. The manipulation with an unknown input leads to a xml external entity reference vulnerability. CWE is classifying the issue as CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-61741 since 07/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.24.1 or 1.0.0-M39 eliminates this vulnerability.

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Productinfo

Vendor

• http4s

Name

• http4s-scala-xml

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24.0
• 1.0.0-M38

Website

• Product: https://github.com/http4s/http4s-scala-xml/

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