CVE-2026-4739Network attack vector

Code execution or crash via unchecked allocation arithmetic

Published Mar 24, 2026 · Updated Mar 24, 2026

Integer overflows in ITK before 2.7.1 allow remote attackers to execute code or interrupt service through crafted XML input. The bundled Expat functions addBinding, build_model, defineAttribute, lookup, nextScaffoldPart, and storeAtts calculate allocation sizes without overflow checks. Exposure requires an application to pass attacker-controlled XML to the bundled parser; wrapped sizes can produce undersized allocations, memory corruption, code execution, or a crash.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflows in ITK before 2.7.1 allow remote attackers to execute code or interrupt service through crafted XML input. The bundled Expat functions addBinding, build_model, defineAttribute, lookup, nextScaffoldPart, and storeAtts calculate allocation sizes without overflow checks. Exposure requires an application to pass attacker-controlled XML to the bundled parser; wrapped sizes can produce undersized allocations, memory corruption, code execution, or a crash.

The record

CVE
CVE-2026-4739
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Insight Software Consortium
Product
ITK
Classifications
CWE-190, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 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 <2.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Insight Software Consortium · ITKversion=0 <2.7.1

Published CVSS scores

9.4Government Technology Agency of Singapore Cyber Security GroupCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

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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