Description
Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tinyproxy | tinyproxy | ≤ 1.11.3 | — |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tinyproxy | No fix yet | — |
| Debian 13 | tinyproxy | No fix yet | — |
| Debian 12 | tinyproxy | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tinyproxy | No fix yet | — |
| Ubuntu 26.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu 25.10 | tinyproxy | No fix yet | — |
| Ubuntu 24.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu 20.04 LTS | tinyproxy | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tinyproxy | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tinyproxy | 1.11.3-3.1 | openSUSE-SU-2026:11060-1 |
| openSUSE Leap 16.0 | tinyproxy | 1.11.3-bp160.2.1 | openSUSE-SU-2026:22133-1 |
Advisories 3
- WID-SEC-2026-1999 Tinyproxy: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 2026
- openSUSE-SU-2026:22133-1 Security update for tinyproxy SUSE / openSUSE Security Updates · Oct 20, 2026
- openSUSE-SU-2026:11060-1 tinyproxy-1.11.3-3.1 on GA media SUSE / openSUSE Security Updates · Jun 19, 2026
References
- Pull Request issue-tracking patch
- Patch Commit patch
- VulnCheck Advisory: Tinyproxy - Stathost Detection Bypass via Host Header Manipulation third-party-advisory