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Vulnerability · Published Mar 24, 2026 · Assigned by GovTech CSG

CVE-2026-4739Integer overflow vulnerabilities in InsightSoftwareConsortium/ITK

Critical 9.4

In plain English

A critical-severity integer overflow in ITK from InsightSoftwareConsortium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)0.3%top 81.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12insighttoolkit4no fix listedDEBIAN-CVE-2026-4739
Debian:12insighttoolkit5no fix listedDEBIAN-CVE-2026-4739
Debian:13insighttoolkit5no fix listedDEBIAN-CVE-2026-4739
Debian:14insighttoolkit5no fix listedDEBIAN-CVE-2026-4739
Ubuntu:25.10cadaverno fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10expatno fix listedUBUNTU-CVE-2026-4739
Ubuntu:22.04:LTSmatanzano fix listedUBUNTU-CVE-2026-4739
Ubuntu:24.04:LTSmatanzano fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10matanzano fix listedUBUNTU-CVE-2026-4739
Ubuntu:26.04:LTSmatanzano fix listedUBUNTU-CVE-2026-4739
Ubuntu:26.10matanzano fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10swish-eno fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10tdomno fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10wbxml2no fix listedUBUNTU-CVE-2026-4739
Ubuntu:25.10xmlrpc-cno fix listedUBUNTU-CVE-2026-4739

Affected products (as reported)

VendorProductVersions
InsightSoftwareConsortium ITK 0 – before 2.7.1

Weakness: CWE-190 · Vector: CVSS: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/S:P/AU:Y/R:U/V:C/RE:M/U:Amber

References