CVE-2026-105946 Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt
Medium 5.3
Published
Updated
Check this codebase for CVE-2026-105946 and fix it if it is affected.
What it is: CVE-2026-105946 is a medium-severity vulnerability in qt, published on 27 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-105946 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-2026-105946/ (Markdown: https://insights.sbomify.com/CVE-2026-105946/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-105946?
CVE-2026-105946 is a medium-severity vulnerability in qt, published on 27 Oct 2026.
Official description
Out-of-bounds read in the QAuthenticator NTLM authentication handling in the Qt Network module in Qt Group Qt allows remote attackers to obtain sensitive information (heap memory contents) or cause a denial of service (application crash) via a crafted NTLM challenge sent by a malicious server or proxy, when an application using QNetworkAccessManager or QTcpSocket authenticates with NTLM.
Weakness: CWE-125
Which versions are affected by CVE-2026-105946?
How do I fix CVE-2026-105946?
No fix has been published for CVE-2026-105946 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105946 being exploited?
There is no known exploitation of CVE-2026-105946 in the wild and no public exploit code.
Sources
Also known as GHSA-99v5-r742-mrm9.