CVE-2026-55202 Tinyproxy - Stathost Detection Bypass via Host Header Manipulation
Unauthenticated attackers can bypass stathost access controls in Tinyproxy by manipulating Host headers or ports, gaining unauthorized access to internal statistics.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55202?
CVE-2026-55202 is a high-severity authentication bypass vulnerability in tinyproxy, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2026-55202?
How do I fix CVE-2026-55202?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-55202 being exploited?
There is no known exploitation of CVE-2026-55202 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-55202, GHSA-f33v-8wrm-6584, UBUNTU-CVE-2026-55202.