CVE catalog

CVE-2026-55202

Severity: Critical · CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Jun 17, 2026, 7:13:45 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.38% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	tinyproxy	sid	`1.11.3-1`	vulnerable
Debian	tinyproxy	forky	`1.11.3-1`	vulnerable
Debian	tinyproxy	trixie	`1.11.2-1`	vulnerable
Debian	tinyproxy	bookworm	`1.11.1-2.1+deb12u1`	vulnerable
Debian	tinyproxy	bookworm-security	`1.11.1-2.1+deb12u1`	vulnerable
Cpe	tinyproxy	Not reported	Not reported	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tinyproxy	source	sid	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	forky	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1140350]

[Debian bug #1140350]

Notes

[trixie] tinyproxy: Minor issue [bookworm] tinyproxy: Minor issue; only exposes the internal stats page, prefix Host match does not bypass BasicAuth verification

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[tinyproxy]Affected
Details (6)
- 1.11.1-2.1+deb12u1 · all · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
[tinyproxy-bin]Affected
Source package: [tinyproxy]
Details (6)
- 1.11.1-2.1+deb12u1 · amd64 · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · arm64 · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12

[Debian 13 (Trixie)]

[tinyproxy]Affected
Details (4)
- 1.11.2-1 · all · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.2-1 · all · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · all · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · all · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
[tinyproxy-bin]Affected
Source package: [tinyproxy]
Details (4)
- 1.11.2-1 · amd64 · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.2-1+b1 · arm64 · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13

Observed: Oct 23, 2026, 9:45:35 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]