CVE-2026-4739

CRITICALNVD 9.49.4—

9.4

Integer Overflow or Wraparound vulnerability in InsightSoftwareConsortium ITK (‎Modules/ThirdParty/Expat/src/expat modules).This issue affects ITK: before 2.7.1.

CVSS v3: 9.4
EG Score: 9.4(medium)
EPSS: 19.8%
KEV: Not listed

Published

March 24, 2026

Last Modified

May 5, 2026

Advisory Details (1)

Auto-updated May 5, 2026

No patch confirmed yet.

generic

BUG: Prevent integer overflow in potential vulnerable cloned functions by npt-1707 · Pull Request #5351 · InsightSoftwareConsortium/ITK · GitHub

https://github.com/InsightSoftwareConsortium/ITK/pull/5351

Vendor Advisories for CVE-2026-4739(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-4739
Microsoft Security Response Center (MSRC)Critical
Integer overflow vulnerabilities in InsightSoftwareConsortium/ITK

Data Freshness Timeline

(refreshed 12× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-23 00:09 UTCEG score recompute
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 20:35 UTCEG score recompute
2026-05-20 20:35 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-4739?

CVE-2026-4739 is a critical vulnerability published on March 24, 2026. Integer Overflow or Wraparound vulnerability in InsightSoftwareConsortium ITK (‎Modules/ThirdParty/Expat/src/expat modules).This issue affects ITK: before 2.7.1.

When was CVE-2026-4739 disclosed?

CVE-2026-4739 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on May 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-4739 actively exploited?

CVE-2026-4739 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-4739?

CVE-2026-4739 has a CVSS v3 base score of 9.4 (NVD).

How do I remediate CVE-2026-4739?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4739, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-4739

📅 Published

🔄 Last Modified

📋 Advisory Details (1)