UBUNTU-CVE-2026-54388 (CVE-2026-54388)
Vulnerability from osv_ubuntu – Published: 2026-06-17 20:17 – Updated: 2026-06-24 09:03 – Source website
VLAI
Details
Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.
Severity
9.1 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.8.3-3ubuntu14.04.1~esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.8.3-3ubuntu14.04.1~esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.8.3-3ubuntu16.04.1~esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.8.3-3ubuntu16.04.1~esm3?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.3-3ubuntu1",
"1.8.3-3ubuntu16.04.1~esm1",
"1.8.3-3ubuntu16.04.1~esm2",
"1.8.3-3ubuntu16.04.1~esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.8.4-5ubuntu0.1~esm3"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.8.4-5ubuntu0.1~esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.8.4-5ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.10.0-4ubuntu0.2"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.10.0-4ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.10.0-4ubuntu0.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.0-2",
"1.10.0-4",
"1.10.0-4ubuntu0.1",
"1.10.0-4ubuntu0.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.11.0-1ubuntu0.1~esm2"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.11.0-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.11.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.0-5",
"1.11.0-1",
"1.11.0-1ubuntu0.1~esm1",
"1.11.0-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.11.1-3ubuntu0.1"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.11.1-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.11.1-3ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.11.1-2.1",
"1.11.1-3",
"1.11.1-3ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.11.2-1"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.11.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.11.2-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.11.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tinyproxy",
"binary_version": "1.11.3-1"
},
{
"binary_name": "tinyproxy-bin",
"binary_version": "1.11.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tinyproxy",
"purl": "pkg:deb/ubuntu/tinyproxy@1.11.3-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.11.2-1",
"1.11.2-1build1",
"1.11.3-1"
]
}
],
"aliases": [],
"details": "Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.",
"id": "UBUNTU-CVE-2026-54388",
"modified": "2026-06-24T09:03:12Z",
"published": "2026-06-17T20:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54388"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54388"
},
{
"type": "REPORT",
"url": "https://github.com/tinyproxy/tinyproxy/issues/609"
},
{
"type": "REPORT",
"url": "https://github.com/tinyproxy/tinyproxy/pull/610"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54388"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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