High
tinyproxy — security advisory
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.
- Products
- tinyproxy
- Affected versions
- 1.10.0-2, 1.10.0-4, 1.10.0-4ubuntu0.1, 1.10.0-4ubuntu0.2, 1.10.0-5, 1.11.0-1, 1.11.0-1ubuntu0.1~esm1, 1.11.0-1ubuntu0.1~esm2, 1.11.1-2.1, 1.11.1-3, 1.11.1-3ubuntu0.1, 1.11.2-1, 1.11.2-1build1, 1.11.3-1, 1.8.3-3ubuntu1, 1.8.3-3ubuntu14.04.1~esm1, 1.8.3-3ubuntu14.04.1~esm2, 1.8.3-3ubuntu14.04.1~esm3, 1.8.3-3ubuntu16.04.1~esm1, 1.8.3-3ubuntu16.04.1~esm2, 1.8.3-3ubuntu16.04.1~esm3, 1.8.4-2, 1.8.4-3, 1.8.4-5, 1.8.4-5ubuntu0.1~esm1, 1.8.4-5ubuntu0.1~esm2, 1.8.4-5ubuntu0.1~esm3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55202
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:09 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-55202
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
tinyproxy
Fixed versions: Not specified
Complete source record
{
"id": "626d5dc9add7294035f705f6986da5b150112451203a2ba4d6bf2b7b466301c1",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-55202",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-55202",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-55202",
"products": [
{
"name": {
"value": "tinyproxy",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.3-3ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.3-3ubuntu14.04.1~esm1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.3-3ubuntu14.04.1~esm2",
"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/2/package/name"
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/2/versions"
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{
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{
"name": {
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"affected_versions": [
{
"value": "1.10.0-2",
"evidence": "/affected/3/versions"
},
{
"value": "1.10.0-4",
"evidence": "/affected/3/versions"
},
{
"value": "1.10.0-4ubuntu0.1",
"evidence": "/affected/3/versions"
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{
"value": "1.10.0-4ubuntu0.2",
"evidence": "/affected/3/versions"
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{
"name": {
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"affected_versions": [
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"value": "1.10.0-5",
"evidence": "/affected/4/versions"
},
{
"value": "1.11.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.11.0-1ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
},
{
"value": "1.11.0-1ubuntu0.1~esm2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.11.1-2.1",
"evidence": "/affected/5/versions"
},
{
"value": "1.11.1-3",
"evidence": "/affected/5/versions"
},
{
"value": "1.11.1-3ubuntu0.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "tinyproxy",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.11.2-1",
"evidence": "/affected/6/versions"
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{
"name": {
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},
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{
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}
]
},
{
"name": {
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"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.11.2-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.11.2-1build1",
"evidence": "/affected/8/versions"
},
{
"value": "1.11.3-1",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-55202",
"aliases": [
"UBUNTU-CVE-2026-55202"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.8.3-3ubuntu1",
"1.8.3-3ubuntu14.04.1~esm1",
"1.8.3-3ubuntu14.04.1~esm2",
"1.8.3-3ubuntu14.04.1~esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55202.json"
},
"ecosystem_specific": {
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"package": {
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"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
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"1.8.3-3ubuntu16.04.1~esm1",
"1.8.3-3ubuntu16.04.1~esm2",
"1.8.3-3ubuntu16.04.1~esm3"
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"database_specific": {
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],
"package": {
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"purl": "pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.8.4-2",
"1.8.4-3",
"1.8.4-5",
"1.8.4-5ubuntu0.1~esm1",
"1.8.4-5ubuntu0.1~esm2",
"1.8.4-5ubuntu0.1~esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55202.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.8.4-5ubuntu0.1~esm3"
},
{
"binary_name": "tinyproxy-bin",
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}
]
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{
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],
"package": {
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.10.0-2",
"1.10.0-4",
"1.10.0-4ubuntu0.1",
"1.10.0-4ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55202.json"
},
"ecosystem_specific": {
"binaries": [
{
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"1.11.0-1ubuntu0.1~esm1",
"1.11.0-1ubuntu0.1~esm2"
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],
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},
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{
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{
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.11.2-1",
"1.11.2-1build1",
"1.11.3-1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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"binary_version": "1.11.3-1"
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]
}
}
],
"modified": "2026-10-17T13:00:26.970845651Z",
"provider": "osv",
"upstream": [
"CVE-2026-55202"
],
"references": [
"https://ubuntu.com/security/CVE-2026-55202",
"https://www.cve.org/CVERecord?id=CVE-2026-55202",
"https://github.com/tinyproxy/tinyproxy/pull/606"
]
},
"related_cves": [
{
"value": "CVE-2026-55202",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360556,
"published_at": "2026-06-17T20:17:00+00:00"
}