CVE-2026-61741

http4s-scala-xml provides EntityDecoder[F, scala.xml.Elem] instances that parse XML message bodies. 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.

No known exploitation

Severity

Critical, CVSS 9.3 (v3.1)

EPSS

0.29% chance of exploitation in 30 days (EPSS, as of Oct 23, 2026)

Affected packages

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