CVE-2026-4739 | InsightSoftwareConsortium ITK up to 2.7.0 expat integer overflow

VDB-352685 · CVE-2026-4739 · GCVE-0-2026-4739 INSIGHTSOFTWARECONSORTIUM ITK UP TO 2.7.0 EXPAT INTEGER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 1.91+ Summaryinfo A vulnerability marked as critical has been reported in InsightSoftwareConsortium ITK up to 2.7.0. This vulnerability affects unknown code of the file ‎Modules/ThirdParty/Expat/src/expat. The manipulation leads to integer overflow. This vulnerability is referenced as CVE-2026-4739. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, has been found in InsightSoftwareConsortium ITK up to 2.7.0. This issue affects an unknown code of the file ‎Modules/ThirdParty/Expat/src/expat. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is: Integer Overflow or Wraparound vulnerability in InsightSoftwareConsortium ITK (‎Modules/ThirdParty/Expat/src/expat modules).This issue affects ITK: before 2.7.1. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-4739 since 03/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. It is declared as attacked. Upgrading to version 2.7.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor InsightSoftwareConsortium Name ITK Version 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7.0 Website Product: https://github.com/InsightSoftwareConsortium/ITK/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Integer overflow CWE: CWE-190 / CWE-189 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Attacked Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: ITK 2.7.1 Patch: github.com Timelineinfo 03/24/2026 Advisory disclosed 03/24/2026 +0 days CVE reserved 03/24/2026 +0 days VulDB entry created 03/24/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-4739 (🔒) GCVE (CVE): GCVE-0-2026-4739 GCVE (VulDB): GCVE-100-352685 Entryinfo Created: 03/24/2026 07:32 Changes: 03/24/2026 07:32 (73) Complete: 🔍 Cache ID: 99:CBB:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸