UBUNTU-CVE-2026-33555

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Source
https://ubuntu.com/security/CVE-2026-33555
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33555.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-33555
Upstream
Downstream
Related
Published
2026-04-13T17:16:00Z
Modified
2026-06-30T18:17:22.697504657Z
Severity
  • 4.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6.

References

Affected packages

Ubuntu:24.04:LTS / haproxy

Package

Name
haproxy
Purl
pkg:deb/ubuntu/haproxy?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.8.16-0ubuntu0.24.04.2

Affected versions

2.*
2.6.15-1ubuntu2
2.8.5-1ubuntu1
2.8.5-1ubuntu2
2.8.5-1ubuntu3
2.8.5-1ubuntu3.1
2.8.5-1ubuntu3.2
2.8.5-1ubuntu3.3
2.8.5-1ubuntu3.4
2.8.15-0ubuntu0.24.04.1
2.8.16-0ubuntu0.24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "2.8.16-0ubuntu0.24.04.2"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "2.8.16-0ubuntu0.24.04.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33555.json"

Ubuntu:25.10 / haproxy

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.12-0ubuntu0.25.10.4

Affected versions

3.*
3.0.8-1ubuntu1
3.0.8-1ubuntu1.1
3.0.10-1ubuntu1
3.0.10-1ubuntu2
3.0.10-1ubuntu3
3.0.12-0ubuntu0.25.10.1
3.0.12-0ubuntu0.25.10.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "3.0.12-0ubuntu0.25.10.4"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "3.0.12-0ubuntu0.25.10.4"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33555.json"

Ubuntu:26.04:LTS / haproxy

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.2.9-1ubuntu2.1

Affected versions

3.*
3.0.10-1ubuntu3
3.2.9-1ubuntu1
3.2.9-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "3.2.9-1ubuntu2.1"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "3.2.9-1ubuntu2.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33555.json"