Quick answers
- Is CVE-2026-119742 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-119742 being exploited in the wild.
- How severe is CVE-2026-119742?
- High severity, with a CVSS score of 7.2, published 3 November 2026.
- Which products and versions are affected?
- Nagios XI before 2026R2.
- Is there a fix for CVE-2026-119742?
- Yes: fixed in 2026R2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-119742 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-119742?
- Check whether you run Nagios XI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 2026R2
Technical details
The install_mib() function in mibs.php uses an incomplete deny-list to sanitize uploaded filenames, omitting semicolons and pipes before passing them to grep via exec(). An authenticated administrator can bypass the sanitization by using tab characters in a crafted filename and piping to sh via a multipart POST request, achieving arbitrary OS command execution as the web server user.
Affected products
- Nagios XI before 2026R2
Timeline
- 2026-11-03: disclosed