CVE-2023-54354Network attack vectorHinoki check available

Process crash via malformed XML schemas

Published Aug 25, 2026 · Updated Aug 28, 2026

NULL pointer dereference in Nokogiri before 1.14.3 allows remote attackers to crash CRuby processes via malformed XML schemas. Packaged libxml2 2.10.3 dereferences NULL schema-processing state in xmlSchemaFixupComplexType and xmlSchemaCheckCOSSTDerivedOK. Exposure requires CRuby with Nokogiri's packaged libraries and an application path that processes attacker-supplied XML schemas; a successful trigger terminates that process without reported data disclosure or modification.

CVSS severity8.7
High
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in Nokogiri before 1.14.3 allows remote attackers to crash CRuby processes via malformed XML schemas. Packaged libxml2 2.10.3 dereferences NULL schema-processing state in xmlSchemaFixupComplexType and xmlSchemaCheckCOSSTDerivedOK. Exposure requires CRuby with Nokogiri's packaged libraries and an application path that processes attacker-supplied XML schemas; a successful trigger terminates that process without reported data disclosure or modification.

The record

CVE
CVE-2023-54354
Published
Aug 25, 2026
Updated
Aug 28, 2026
Vendor
Sparkle Motion
Product
Nokogiri
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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 <1.14.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sparkle Motion · Nokogiriversion=0 <1.14.3

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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

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-476NULL Pointer Dereference
T1499.004Application 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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