CVE-2026-26833 thumbler allows OS Command Injection
An attacker can execute arbitrary OS commands by injecting malicious input into the thumbnail function parameters in the thumbler library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26833?
CVE-2026-26833 is a critical command injection vulnerability in n/a, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.
Which versions are affected by CVE-2026-26833?
2 open source packages ship an affected version, including thumbler. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
thumbler npm | All versions to 1.1.2 | None |
thumbler npm | All versions to 1.1.2 | None |
Products include Mmahrous Thumbler.
How do I fix CVE-2026-26833?
No fix has been published for CVE-2026-26833 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-26833 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26833 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-mvhf-547c-h55r.