# CVE-2026-19248: Unbounded recursion vulnerability in the QDomNode destructor of Qt XML impacts Qt

> Attackers can cause a denial-of-service crash in applications using Qt XML by sending specially crafted untrusted input.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:N/R:U/V:D/RE:L`)
- **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:** Yes
- **Published:** 16 Sep 2026
- **Updated:** 16 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-19248, ECHO-1033-a641-0eec, GHSA-j2w2-j66p-cjg6, OESA-2026-4212, OESA-2026-4344, OESA-2026-4345, OESA-2026-4346, RHSA-2026:68801, UBUNTU-CVE-2026-19248

## What is CVE-2026-19248?

CVE-2026-19248 is a high-severity denial of service vulnerability in qt, published on 16 Sep 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

QDomDocument XML parsing is vulnerable to a remotely-triggerable denial-of-service crash when processing untrusted input.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2026-19248?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `qt5-qtbase` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-common` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-devel` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-examples` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-gui` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-ibase` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-mysql` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-odbc` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-postgresql` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-private-devel` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-static` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
| `qt5-qtbase-tds` | Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |

## How do I fix CVE-2026-19248?

Apply the vendor's patch.

## Is CVE-2026-19248 being exploited?

There is no known exploitation of CVE-2026-19248 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19248 and fix it if it is affected.

What it is: CVE-2026-19248 is a high-severity denial of service vulnerability in qt, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-19248 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-2026-19248/ (Markdown: https://insights.sbomify.com/CVE-2026-19248/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19248
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19248
- OSV: https://osv.dev/vulnerability/CVE-2026-19248

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19248/
Summaries are generated and may contain mistakes; the official description above is the record.