CVE-2026-4739 Integer overflow vulnerabilities in InsightSoftwareConsortium/ITK
An integer overflow in the bundled Expat module of the ITK library allows attackers to potentially execute code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-4739?
CVE-2026-4739 is a critical vulnerability in InsightSoftwareConsortium ITK, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Integer Overflow or Wraparound vulnerability in InsightSoftwareConsortium ITK (Modules/ThirdParty/Expat/src/expat modules).This issue affects ITK: before 2.7.1.
Weakness: CWE-190
Which versions are affected by CVE-2026-4739?
How do I fix CVE-2026-4739?
No fix has been published for CVE-2026-4739 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4739 being exploited?
There is no known exploitation of CVE-2026-4739 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-4739, GHSA-9vxh-wwmc-c2m7, UBUNTU-CVE-2026-4739.