# CVE-2025-30348: Denial of service in Qt

> An attacker can cause a denial of service in applications using Qt's QDom by triggering a complex algorithm in encodeText.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Mar 2025
- **Updated:** 21 Mar 2025
- **Also known as:** AZL-58948, AZL-58958, DEBIAN-CVE-2025-30348, GHSA-hc3c-6xqp-r265, OESA-2025-1384, OESA-2025-1385, OESA-2025-1386, OESA-2025-1387, OESA-2025-1493, OESA-2025-1494, UBUNTU-CVE-2025-30348

## What is CVE-2025-30348?

CVE-2025-30348 is a medium-severity denial of service vulnerability in Qt Qt, published on 21 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

encodeText in QDom in Qt before 6.8.0 has a complex algorithm involving XML string copy and inline replacement of parts of a string (with relocation of later data).

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2025-30348?

It affects 1 product.


Products: Qt Qt.

## How do I fix CVE-2025-30348?

Upgrade to a fixed version.

## Is CVE-2025-30348 being exploited?

There is no known exploitation of CVE-2025-30348 in the wild and no public exploit code.

## Other vulnerabilities in Qt Qt

- [CVE-2020-12267](https://insights.sbomify.com/CVE-2020-12267/): Use after free in n/a (critical 9.8)
- [CVE-2017-10904](https://insights.sbomify.com/CVE-2017-10904/): Command injection in Qt for Android (critical 9.8)
- [CVE-2011-3194](https://insights.sbomify.com/CVE-2011-3194/): Memory corruption in n/a (critical 9.3)
- [CVE-2022-40983](https://insights.sbomify.com/CVE-2022-40983/): Integer overflow in Qt (high 8.8)
- [CVE-2022-43591](https://insights.sbomify.com/CVE-2022-43591/): Memory corruption in Qt (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-30348 and fix it if it is affected.

What it is: CVE-2025-30348 is a medium-severity denial of service vulnerability in Qt Qt, published on 21 Mar 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-2025-30348 in the wild and no public exploit code.

Affected product: Qt 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-2025-30348/ (Markdown: https://insights.sbomify.com/CVE-2025-30348/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-30348
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-30348
- OSV: https://osv.dev/vulnerability/CVE-2025-30348

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-30348/
Summaries are generated and may contain mistakes; the official description above is the record.