CVE-2026-57234Network attack vector

Authenticated SSRF via NONET scheme-filter bypass

Published Jun 25, 2026 · Updated Jun 25, 2026

SSRF in Nokogiri before 1.19.4 allows remote authenticated users to make JRuby applications fetch external resources through XML schemas. The JRuby XML::Schema resolver applies NONET through an incomplete, case-sensitive scheme denylist, allowing disallowed network schemes to reach the resolver. Exploitation requires user interaction and an application that parses an attacker-controlled schema; CRuby is unaffected.

CVSS severity2.6
Low
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Nokogiri before 1.19.4 allows remote authenticated users to make JRuby applications fetch external resources through XML schemas. The JRuby XML::Schema resolver applies NONET through an incomplete, case-sensitive scheme denylist, allowing disallowed network schemes to reach the resolver. Exploitation requires user interaction and an application that parses an attacker-controlled schema; CRuby is unaffected.

The record

CVE
CVE-2026-57234
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Sparkle Motion
Product
Nokogiri
Classifications
CWE-184, CWE-611, CWE-178
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=< 1.19.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sparkle Motion · Nokogiriversion=< 1.19.4

Published CVSS scores

2.6GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-611Improper Restriction of XML External Entity Reference
CWE-178Improper Handling of Case Sensitivity

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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