UBUNTU-CVE-2026-28369

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Source
https://ubuntu.com/security/CVE-2026-28369
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-28369
Upstream
  • CVE-2026-28369
Published
2026-03-27T17:16:00Z
Modified
2026-05-20T16:24:53.151911195Z
Severity
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.

References

Affected packages

Ubuntu:25.10
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.18-1
2.3.18-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.3.18-2",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:26.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.18-2
2.3.20-1
2.3.20-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.3.20-1ubuntu1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:Pro:16.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3.4-1
1.3.5-1
1.3.7-1
1.3.11-1
1.3.16-1
1.3.16-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.3.16-1ubuntu0.1~esm1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:Pro:18.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.4.20-1
1.4.21-1
1.4.22-1
1.4.23-1
1.4.23-2build1
1.4.23-3
1.4.23-3ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.4.23-3ubuntu0.1~esm1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:Pro:20.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.0.23-1
2.0.27-1
2.0.28-1
2.0.29-1
2.0.29-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.0.29-1ubuntu0.1~esm1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:Pro:22.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.8-1
2.2.12-1
2.2.13-1
2.2.14-1
2.2.16-1
2.2.16-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.2.16-1ubuntu0.1~esm1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"
Ubuntu:Pro:24.04:LTS
undertow

Package

Name
undertow
Purl
pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.8-2
2.3.8-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.3.8-2ubuntu0.1~esm1",
            "binary_name": "libundertow-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28369.json"