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Fencer Vulns
critical 9.3

CVE-2026-61741 json

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

published 2026-09-24 45 d ago modified 2026-09-30 39 d ago also GHSA-cjx3-73hr-rpw7 , EUVD-2026-86332

cvss
9.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.http4s:http4s-scala-xml_2.12 0.24.1
  • maven org.http4s:http4s-scala-xml_2.13 0.24.1, 1.0.0-M39
  • maven org.http4s:http4s-scala-xml_3 0.24.1, 1.0.0-M39

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
41 d ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
GitHub 3.1 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Affected packages

ecosystem package affected fixed in
maven org.http4s:http4s-scala-xml_2.12
<0.24.1
0.24.1
maven org.http4s:http4s-scala-xml_2.13
<0.24.1
>=1.0.0-M1, <1.0.0-M39
0.24.1
1.0.0-M39
maven org.http4s:http4s-scala-xml_3
<0.24.1
>=1.0.0-M1, <1.0.0-M39
0.24.1
1.0.0-M39

Affected products

  • http4s http4s-scala-xml

Classification

Weakness
  • CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.