CVE-2026-57437Network attack vector

Process crash via unretained XPath source document

Published Jun 25, 2026 · Updated Jun 25, 2026

Use-after-free in Nokogiri before 1.19.4 allows CRuby applications to crash when evaluating a stale XML::XPathContext. Nokogiri::XML::XPathContext fails to retain its source document, so garbage collection can free the document before a later XPath evaluation reads it. Reachability requires direct XPathContext construction and continued use after losing the document reference; normal xpath and css searches and malicious document input do not trigger it.

CVSS severity1.7
Low
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Nokogiri before 1.19.4 allows CRuby applications to crash when evaluating a stale XML::XPathContext. Nokogiri::XML::XPathContext fails to retain its source document, so garbage collection can free the document before a later XPath evaluation reads it. Reachability requires direct XPathContext construction and continued use after losing the document reference; normal xpath and css searches and malicious document input do not trigger it.

The record

CVE
CVE-2026-57437
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Sparkle Motion
Product
Nokogiri
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Sparkle Motion · Nokogiriversion=< 1.19.4

Published CVSS scores

1.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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