RCE in Mmahrous Thumbler
CVE-2026-26833
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.033 · change: +0.010
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mmahrous/thumbler (Product)
- www.npmjs.com/package/thumbler (Product)
- github.com/mmahrous/thumbler/blob/master/lib/thumbler.js (Not Applicable)
- github.com/zebbernCVE/CVE-2026-26833 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-26833?
- CVE-2026-26833 is a critical-severity vulnerability in Mmahrous Thumbler, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-03-25.
- How severe is CVE-2026-26833?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-26833 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.