# 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.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Dec 2025
- **Updated:** 29 Jul 2026
- **Also known as:** AZL-71555, AZL-71647, DEBIAN-CVE-2025-12385, GHSA-x9vj-67g7-457m, OESA-2025-2844, OESA-2025-2845, OESA-2025-2846, OESA-2025-2870, OESA-2025-2871, OESA-2025-2872, OESA-2025-2873, OESA-2025-2874, UBUNTU-CVE-2025-12385, USN-8357-1

## 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.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-1284 (Improper Validation of Specified Quantity in Input)

## Which versions are affected by CVE-2025-12385?


## How do I fix CVE-2025-12385?

Upgrade to a fixed version.

## Is CVE-2025-12385 being exploited?

There is no known exploitation of CVE-2025-12385 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12385 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-12385 in the wild and no public exploit code.

Affected product: Qt. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-12385/ (Markdown: https://insights.sbomify.com/CVE-2025-12385/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12385
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12385
- OSV: https://osv.dev/vulnerability/CVE-2025-12385

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12385/
Summaries are generated and may contain mistakes; the official description above is the record.