# CVE-2026-7740: justdan96 tsMuxer vvc.cpp setFPS denial of service

> A local attacker can cause a denial of service in tsMuxer by manipulating the track_id argument in the setFPS function.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 May 2026
- **Updated:** 4 May 2026
- **Also known as:** GHSA-5p4r-jv9q-2fw8

## What is CVE-2026-7740?

CVE-2026-7740 is a medium-severity denial of service vulnerability in justdan96 tsMuxer, published on 4 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A security vulnerability has been detected in justdan96 tsMuxer up to 2.7.0. This issue affects the function VvcVpsUnit::setFPS of the file tsMuxer/vvc.cpp. Such manipulation of the argument track_id leads to denial of service. An attack has to be approached locally. The exploit has been disclosed publicly and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-7740?


## How do I fix CVE-2026-7740?

No fix has been published for CVE-2026-7740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7740 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7740 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7740 and fix it if it is affected.

What it is: CVE-2026-7740 is a medium-severity denial of service vulnerability in justdan96 tsMuxer, published on 4 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7740 exists.

Affected product: justdan96 tsMuxer. 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-2026-7740/ (Markdown: https://insights.sbomify.com/CVE-2026-7740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7740
- OSV: https://osv.dev/vulnerability/CVE-2026-7740

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7740/
Summaries are generated and may contain mistakes; the official description above is the record.