GHSA-cjx3-73hr-rpw7

Suggest an improvement
Source
https://github.com/advisories/GHSA-cjx3-73hr-rpw7
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-cjx3-73hr-rpw7
Aliases
Published
2026-09-24T19:35:16Z
Modified
2026-09-24T19:45:05Z
Severity
  • 9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L CVSS Calculator
Summary
http4s-scala-xml has an XML External Entity (XXE) processing issue
Details

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.

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.

Impact

Any service that derives an XML EntityDecoder from this library and parses attacker-controlled input is affected.

Patches

The default SAXParserFactory is now hardened:

  • secure processing is enabled
  • DOCTYPE declarations are disallowed
  • external general/parameter entities and external DTD loading are disabled
  • DTD URIs are not resolved
  • XInclude is disabled.

These defaults match scala.xml.XMLLoader's defaults since 2.0.0.

Workarounds

Before upgrading, override ElemInstances#saxFactory with a hardened factory.

  val secured = new ElemInstances {
    override protected val saxFactory = {
      val f = javax.xml.parsers.SAXParserFactory.newInstance
      f.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true)
      // etc.
      f
    }
  }
  import secured._
Database specific 
{
    "cwe_ids":  [
        "CWE-611"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-24T19:35:16Z",
    "nvd_published_at":  "2026-09-24T18:17:16Z",
    "severity":  "CRITICAL"
}
References

Affected packages

Maven
org.http4s:http4s-scala-xml_2.12

Package

Name
org.http4s:http4s-scala-xml_2.12
View open source insights on deps.dev
Purl
pkg:maven/org.http4s/http4s-scala-xml_2.12

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.24.1

Affected versions

0.*
0.10.0-M10
0.15.0
0.15.0a
0.15.1
0.15.1a
0.15.2
0.15.2a
0.15.3
0.15.3a
0.15.4
0.15.4a
0.15.5
0.15.5a
0.15.6
0.15.6a
0.15.7
0.15.7a
0.15.8
0.15.8a
0.15.9
0.15.9a
0.15.10
0.15.10a
0.15.11
0.15.11a
0.15.12
0.15.12a
0.15.13
0.15.13a
0.15.14
0.15.14a
0.15.15
0.15.15a
0.15.16
0.15.16a
0.16.0-M1
0.16.0-M2
0.16.0-M3
0.16.0-RC1
0.16.0-RC2
0.16.0-RC3
0.16.0
0.16.0a-M1
0.16.0a-M2
0.16.0a-M3
0.16.0a-RC1
0.16.0a-RC2
0.16.0a-RC3
0.16.0a
0.16.1
0.16.1a
0.16.2
0.16.2a
0.16.3
0.16.3a
0.16.4
0.16.4a
0.16.5
0.16.5a
0.16.6
0.16.6a
0.17.0-M1
0.17.0-M2
0.17.0-M3
0.17.0-RC1
0.17.0-RC2
0.17.0-RC3
0.17.0
0.17.1
0.17.2
0.17.3
0.17.4
0.17.5
0.17.6
0.18.0-M1
0.18.0-M2
0.18.0-M3
0.18.0-M4
0.18.0-M5
0.18.0-M6
0.18.0-M7
0.18.0-M8
0.18.0-M9
0.18.0
0.18.1
0.18.2
0.18.3
0.18.4
0.18.5
0.18.6
0.18.7
0.18.8
0.18.9
0.18.10
0.18.11
0.18.12
0.18.13
0.18.14
0.18.15
0.18.16
0.18.17
0.18.18
0.18.19
0.18.20
0.18.21
0.18.22
0.18.23
0.18.24
0.18.25
0.18.26
0.19.0-M1
0.19.0-M2
0.19.0-M3
0.19.0-M4
0.19.0
0.20.0-M1
0.20.0-M2
0.20.0-M3
0.20.0-M4
0.20.0-M5
0.20.0-M6
0.20.0-M7
0.20.0-RC1
0.20.0
0.20.1
0.20.2
0.20.3
0.20.4
0.20.5
0.20.6
0.20.7
0.20.8
0.20.9
0.20.10
0.20.11
0.20.12
0.20.13
0.20.14
0.20.15
0.20.16
0.20.17
0.20.18
0.20.19
0.20.20
0.20.21
0.20.22
0.20.23
0.21.0-M1
0.21.0-M2
0.21.0-M3
0.21.0-M4
0.21.0-M5
0.21.0-M6
0.21.0-RC1
0.21.0-RC2
0.21.0-RC3
0.21.0-RC4
0.21.0-RC5
0.21.0
0.21.1
0.21.2
0.21.3
0.21.4
0.21.5
0.21.6
0.21.7
0.21.8
0.21.9
0.21.11
0.21.12
0.21.13
0.21.14
0.21.15
0.21.16
0.21.17
0.21.18
0.21.19
0.21.20
0.21.21
0.21.22
0.21.23
0.21.24
0.21.25
0.21.26
0.21.27
0.21.28
0.21.29
0.21.30
0.21.31
0.21.32
0.21.33
0.21.34
0.22.0-M1
0.22.0-M2
0.22.0-M3
0.22.0-M4
0.22.0-M5
0.22.0-M6
0.22.0-M7
0.22.0-M8
0.22.0-RC1
0.22.0
0.22-53-01128f5
0.22-96-55d3184
0.22-129-24d065b
0.22-143-49b5a8d
0.22.1
0.22.2
0.22.3
0.22.4
0.22.5
0.22.6
0.22.7
0.22.8
0.22.9
0.22.10
0.22.11
0.22.12
0.22.13
0.22.14
0.22.15
0.23.0-M1
0.23.0-RC1
0.23.0
0.23.1
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.23.7
0.23.8
0.23.9
0.23.10
0.23.11
0.23.12
0.23.13
0.23.14
0.23.15
0.24.0

Database specific

last_known_affected_version_range 
"<= 0.24.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json"
org.http4s:http4s-scala-xml_2.13

Package

Name
org.http4s:http4s-scala-xml_2.13
View open source insights on deps.dev
Purl
pkg:maven/org.http4s/http4s-scala-xml_2.13

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.24.1

Affected versions

0.*
0.10.0-M10
0.21.0-M1
0.21.0-M2
0.21.0-M3
0.21.0-M4
0.21.0-M5
0.21.0-M6
0.21.0-RC1
0.21.0-RC2
0.21.0-RC3
0.21.0-RC4
0.21.0-RC5
0.21.0
0.21.1
0.21.2
0.21.3
0.21.4
0.21.5
0.21.6
0.21.7
0.21.8
0.21.9
0.21.11
0.21.12
0.21.13
0.21.14
0.21.15
0.21.16
0.21.17
0.21.18
0.21.19
0.21.20
0.21.21
0.21.22
0.21.23
0.21.24
0.21.25
0.21.26
0.21.27
0.21.28
0.21.29
0.21.30
0.21.31
0.21.32
0.21.33
0.21.34
0.22.0-M1
0.22.0-M2
0.22.0-M3
0.22.0-M4
0.22.0-M5
0.22.0-M6
0.22.0-M7
0.22.0-M8
0.22.0-RC1
0.22.0
0.22-53-01128f5
0.22-96-55d3184
0.22-129-24d065b
0.22-143-49b5a8d
0.22.1
0.22.2
0.22.3
0.22.4
0.22.5
0.22.6
0.22.7
0.22.8
0.22.9
0.22.10
0.22.11
0.22.12
0.22.13
0.22.14
0.22.15
0.23.0-M1
0.23.0-RC1
0.23.0
0.23.1
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.23.7
0.23.8
0.23.9
0.23.10
0.23.11
0.23.12
0.23.13
0.23.14
0.23.15
0.24.0

Database specific

last_known_affected_version_range 
"<= 0.24.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json"
org.http4s:http4s-scala-xml_2.13

Package

Name
org.http4s:http4s-scala-xml_2.13
View open source insights on deps.dev
Purl
pkg:maven/org.http4s/http4s-scala-xml_2.13

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.0.0-M1
Fixed
1.0.0-M39

Affected versions

1.*
1.0.0-M2
1.0.0-M3
1.0.0-M4
1.0.0-M5
1.0.0-M6
1.0.0-M7
1.0.0-M8
1.0.0-M9
1.0.0-M10
1.0.0-M13
1.0.0-M14
1.0.0-M15
1.0.0-M16
1.0.0-M17
1.0.0-M18
1.0.0-M19
1.0.0-M20
1.0.0-M21
1.0.0-M22
1.0.0-M23
1.0.0-M24
1.0.0-M25
1.0.0-M27
1.0.0-M28
1.0.0-M29
1.0.0-M30
1.0.0-M31
1.0.0-M32
1.0.0-M33
1.0.0-M34
1.0.0-M35
1.0.0-M38
1.0.0-M38.1

Database specific

last_known_affected_version_range 
"<= 1.0.0-M38.1"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json"
org.http4s:http4s-scala-xml_3

Package

Name
org.http4s:http4s-scala-xml_3
View open source insights on deps.dev
Purl
pkg:maven/org.http4s/http4s-scala-xml_3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.24.1

Affected versions

0.*
0.22.0-M8
0.22.0-RC1
0.22.0
0.22.1
0.22.2
0.22.3
0.22.4
0.22.5
0.22.6
0.22.7
0.22.8
0.22.9
0.22.10
0.22.11
0.22.12
0.22.13
0.22.14
0.22.15
0.23.0-M1
0.23.0-RC1
0.23.0
0.23.1
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.23.7
0.23.8
0.23.9
0.23.10
0.23.11
0.23.12
0.23.13
0.23.14
0.23.15
0.24.0

Database specific

last_known_affected_version_range 
"<= 0.24.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json"
org.http4s:http4s-scala-xml_3

Package

Name
org.http4s:http4s-scala-xml_3
View open source insights on deps.dev
Purl
pkg:maven/org.http4s/http4s-scala-xml_3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.0.0-M1
Fixed
1.0.0-M39

Affected versions

1.*
1.0.0-M22
1.0.0-M23
1.0.0-M24
1.0.0-M25
1.0.0-M27
1.0.0-M28
1.0.0-M29
1.0.0-M30
1.0.0-M31
1.0.0-M32
1.0.0-M33
1.0.0-M34
1.0.0-M35
1.0.0-M38
1.0.0-M38.1

Database specific

last_known_affected_version_range 
"<= 1.0.0-M38.1"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cjx3-73hr-rpw7/GHSA-cjx3-73hr-rpw7.json"