CVE-2025-3512 Buffer overflow in QTextMarkdownImporter
A heap-based buffer overflow in Qt's QTextMarkdownImporter allows attackers to execute arbitrary code or cause denial of service via a malformed markdown file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-3512?
CVE-2025-3512 is a medium-severity memory corruption vulnerability in Qt, published on 11 Apr 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
There is a Heap-based Buffer Overflow vulnerability in QTextMarkdownImporter. This requires an incorrectly formatted markdown file to be passed to QTextMarkdownImporter to trigger the overflow.
This issue affects Qt from 6.8.0 to 6.8.4. Versions up to 6.6.0 are known to be unaffected, and the fix is in 6.8.4 and later.
Weakness: CWE-122
Which versions are affected by CVE-2025-3512?
How do I fix CVE-2025-3512?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-3512 being exploited?
There is no known exploitation of CVE-2025-3512 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-3512, GHSA-794f-v4rm-x7r5, UBUNTU-CVE-2025-3512.