CVE-2026-12805 OFFIS DCMTK ofxml.cc parseFile heap-based overflow
A heap-based buffer overflow in DCMTK's XML parser allows remote attackers to execute arbitrary code or cause denial of service via crafted files.
- 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
- Available
What is CVE-2026-12805?
CVE-2026-12805 is a medium-severity memory corruption vulnerability in OFFIS DCMTK, published on 21 Jun 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
A flaw has been found in OFFIS DCMTK up to 3.7.0. The affected element is the function XMLNode::parseFile in the library ofstd/libsrc/ofxml.cc. Executing a manipulation can lead to heap-based buffer overflow. The attack may be performed from remote. The exploit has been published and may be used. This patch is called 1d4b3815c0987840a983160bfc671fef63a3105b. It is best practice to apply a patch to resolve this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Which versions are affected by CVE-2026-12805?
How do I fix CVE-2026-12805?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-12805 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12805 exists.
Sources
Also known as DEBIAN-CVE-2026-12805, GHSA-35pp-gpq2-4898, UBUNTU-CVE-2026-12805.