What is CVE-2026-55202?

CVE-2026-55202 is a high-severity vulnerability in Tinyproxy, classified under Authentication Bypass by Spoofing. CVSS score: 8.2/10. Published 2026-06-17.

How severe is CVE-2026-55202?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Tinyproxy

CVE-2026-55202

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 vi…

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Tinyproxy — versions 0, 09312a185ae25cc486b4ff5987638a7917a48bce

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-55202?: CVE-2026-55202 is a high-severity vulnerability in Tinyproxy, classified under Authentication Bypass by Spoofing. CVSS score: 8.2/10. Published 2026-06-17.
How severe is CVE-2026-55202?: High severity. CVSS v3 base score is 8.2 out of 10.