Vulnerability · Published Jun 17, 2026 · Assigned by VulnCheck

CVE-2026-55202Tinyproxy - Stathost Detection Bypass via Host Header Manipulation

High 8.2

In plain English

A high-severity authentication bypass by spoofing in tinyproxy from tinyproxy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.4%top 67.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	tinyproxy	no fix listed	DEBIAN-CVE-2026-55202
Debian:13	tinyproxy	no fix listed	DEBIAN-CVE-2026-55202
Debian:14	tinyproxy	no fix listed	DEBIAN-CVE-2026-55202
Ubuntu:24.04:LTS	tinyproxy	no fix listed	UBUNTU-CVE-2026-55202
Ubuntu:25.10	tinyproxy	no fix listed	UBUNTU-CVE-2026-55202
Ubuntu:26.04:LTS	tinyproxy	no fix listed	UBUNTU-CVE-2026-55202
Ubuntu:26.10	tinyproxy	no fix listed	UBUNTU-CVE-2026-55202

Affected products (as reported)

Vendor	Product	Versions
tinyproxy	tinyproxy	0 – through 1.11.3

Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References

Pull Request issue-tracking
Patch Commit patch
VulnCheck Advisory: Tinyproxy - Stathost Detection Bypass via Host Header Manipulation third-party-advisory