CVE-2025-12385 Improper validation of <img> tag size in Text component parser
Attackers can cause application unresponsiveness via excessive resource allocation in Qt Quick Text component by exploiting missing image size validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-12385?
CVE-2025-12385 is a high-severity denial of service vulnerability in Qt, published on 3 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Allocation of Resources Without Limits or Throttling, Improper Validation of Specified Quantity in Input vulnerability in The Qt Company Qt on Windows, MacOS, Linux, iOS, Android, x86, ARM, 64 bit, 32 bit allows Excessive Allocation.
This issue affects users of the Text component in Qt Quick. Missing validation of the width and height in the <img> tag could cause an application to become unresponsive.
This issue affects Qt: from 5.0.0 through 6.5.10, from 6.6.0 through 6.8.5, from 6.9.0 through 6.10.0.
Which versions are affected by CVE-2025-12385?
How do I fix CVE-2025-12385?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-12385 being exploited?
There is no known exploitation of CVE-2025-12385 in the wild and no public exploit code.
Sources
Also known as AZL-71555, AZL-71647, DEBIAN-CVE-2025-12385, GHSA-x9vj-67g7-457m, OESA-2025-2844, OESA-2025-2845 and 8 more.