Description
Munin munin-httpd 2.99.1 through 2.999.18 contains a path traversal vulnerability in the static file handler of Munin::Master::HTML::handle_request that allows unauthenticated attackers to read files outside the static directory. Attackers can request /static/../<file> to bypass the '/../' substring check and read munin.conf and plugin-conf.d files containing monitored service credentials.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| munin-monitoring | munin | 2.99.1 – ≤ 2.999.18 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | munin | No fix yet | — |
| Ubuntu 26.04 LTS | munin | No fix yet | — |
| Ubuntu 24.04 LTS | munin | No fix yet | — |
| Ubuntu 22.04 LTS | munin | No fix yet | — |
| Ubuntu 20.04 LTS | munin | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | munin | No fix yet | — |
| Ubuntu 16.04 LTS | munin | No fix yet | — |
| Ubuntu 14.04 LTS | munin | No fix yet | — |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Munin munin-httpd 2.99.1-2.999.18 - Unauthenticated Path Traversal http/cves/2026/CVE-2026-125357.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- GitHub Issue #1710 issue-tracking
- https://github.com/munin-monitoring/munin product
- https://github.com/munin-monitoring/munin/blob/2.999.18/lib/Munin/Master/HTML.pm#L30-L58 technical-description
- https://github.com/munin-monitoring/munin/commit/e7b6f452ccca04cff8a0e7285c1279b116a768e1 patch
- VulnCheck Advisory: Munin munin-httpd through 2.999.18 Path Traversal via Static File Handler third-party-advisory