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Advisory record · GHSA-cjx3-73hr-rpw7

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

CVSS 9.3 CriticalCriticalEPSS 0.0029 · 22nd percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 24 Sept 2026, 19:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.http4s:http4s-scala-xml_2.12Maven<0.24.10.24.1
org.http4s:http4s-scala-xml_2.13Maven<0.24.1 || >=1.0.0-M1, <1.0.0-M390.24.1, 1.0.0-M39
org.http4s:http4s-scala-xml_3Maven<0.24.1 || >=1.0.0-M1, <1.0.0-M390.24.1, 1.0.0-M39
Identifiers
GHSA-cjx3-73hr-rpw7 · CVE-2026-61741
Weakness (CWE)
CWE-611
Tags
Published
24 Sept 2026
Updated
24 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The http4s-scala-xml library is vulnerable to XML External Entity (XXE) attacks in versions before 0.24.1 and in 1.0.0-M1 through 1.0.0-M38 of the 2.13 and 3 builds. Services that use its XML decoders to parse untrusted input can be exploited by sending crafted XML, allowing local file disclosure, server-side request forgery, or denial of service. Upgrade to 0.24.1 or 1.0.0-M39.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0029, the 22nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.