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[ CVE-2026-61741 · Published 24 Sep 2026 ]

http4s-scala-xml has an XML External Entity (XXE) processing issue

CVSS 9.3 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Critical severity: CVSS 9.3

[ Description ]Official 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.

[ Fixes ]Fixes and patches

[ Packages ]Affected open-source packages

  • org.http4s:http4s-scala-xml_2.12 mavenAffected <= 0.24.0 · fixed in 0.24.1 · GHSA-cjx3-73hr-rpw7
  • org.http4s:http4s-scala-xml_2.13 mavenAffected <= 0.24.0 · fixed in 0.24.1 · GHSA-cjx3-73hr-rpw7
  • org.http4s:http4s-scala-xml_2.13 mavenAffected >= 1.0.0-M1, <= 1.0.0-M38.1 · fixed in 1.0.0-M39 · GHSA-cjx3-73hr-rpw7
  • org.http4s:http4s-scala-xml_3 mavenAffected <= 0.24.0 · fixed in 0.24.1 · GHSA-cjx3-73hr-rpw7
  • org.http4s:http4s-scala-xml_3 mavenAffected >= 1.0.0-M1, <= 1.0.0-M38.1 · fixed in 1.0.0-M39 · GHSA-cjx3-73hr-rpw7

[ References ]References