Read the docs
TI-2026-39882 Aliases CVE-2026-55202GHSA-f33v-8wrm-6584

Tinyproxy - Stathost Detection Bypass via Host Header Manipulation

Priority MEDIUM 44CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-290.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00381 32nd percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
tinyproxytinyproxyup to 1.11.3—Patch availableCNA
  • tinyproxy Vendortinyproxy Affected up to 1.11.3 Fixed in — Patch available CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55202
  2. 2026-10-03 Alias added: GHSA-f33v-8wrm-6584

References

Patch 2

  • TI-2023-27093 Use after free in Tinyproxy CVSS 3.1CRITICAL 9.8
  • TI-2026-39266 Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers CVSS 4.0CRITICAL 9.3
  • TI-2001-00129 Buffer overflow in Tinyproxy HTTP proxy 1.3.3 and earlier allows remote attackers to… CVSS 2.0HIGH 10.0
  • TI-2026-39265 Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization CVSS 4.0CRITICAL 9.3
  • TI-2026-03412 tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service CVSS 4.0HIGH 8.7
  • TI-2002-00822 tinyproxy HTTP proxy 1.5.0, 1.4.3, and earlier allows remote attackers to execute… CVSS 2.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences