CVE-2026-61741Network attack vectorHinoki check available

File disclosure and SSRF via unsafe XML parsing

Published Sep 24, 2026 · Updated Sep 24, 2026

XXE in http4s-scala-xml before 0.24.1 and 1.0.0-M1 through 1.0.0-M38 allows remote attackers to read files or issue server requests. EntityDecoder instances create SAXParserFactory parsers with default JDK settings, leaving DOCTYPE declarations and external general, parameter, and DTD resolution enabled. Exploitation requires an application to parse attacker-controlled XML with these decoders; successful payloads read process-accessible files, reach internal resources, or exhaust resources through entity expansion.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

XXE in http4s-scala-xml before 0.24.1 and 1.0.0-M1 through 1.0.0-M38 allows remote attackers to read files or issue server requests. EntityDecoder instances create SAXParserFactory parsers with default JDK settings, leaving DOCTYPE declarations and external general, parameter, and DTD resolution enabled. Exploitation requires an application to parse attacker-controlled XML with these decoders; successful payloads read process-accessible files, reach internal resources, or exhaust resources through entity expansion.

The record

CVE
CVE-2026-61741
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
http4s
Product
http4s-scala-xml
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.24.1
  2. Affected versionversion=>= 1.0.0-M1, < 1.0.0-M39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

http4s · http4s-scala-xmlversion=< 0.24.1; version=>= 1.0.0-M1, < 1.0.0-M39

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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