UBUNTU-CVE-2026-55204

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Source

https://ubuntu.com/security/CVE-2026-55204

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55204

Upstream

CVE-2026-55204

Downstream

USN-8459-1

Related

USN-8459-1

Published

2026-06-19T00:00:00Z

Modified

2026-06-24T11:02:00.607443075Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpackdhtinsert() within src/hpack-tbl.c that fails to validate the return value of hpackdhtdefrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.

References

Affected packages

Ubuntu:20.04:LTS

haproxy

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.5-1

2.0.8-1

2.0.9-1

2.0.10-1

2.0.10-1ubuntu1

2.0.11-1ubuntu1

2.0.12-1ubuntu2

2.0.13-1ubuntu2

2.0.13-2

2.0.13-2ubuntu0.1

2.0.13-2ubuntu0.2

2.0.13-2ubuntu0.3

2.0.13-2ubuntu0.5

2.0.29-0ubuntu1

2.0.29-0ubuntu1.1

2.0.29-0ubuntu1.3

2.0.31-0ubuntu0.1

2.0.31-0ubuntu0.2

2.0.31-0ubuntu0.3

2.0.33-0ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.0.33-0ubuntu0.1",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "2.0.33-0ubuntu0.1",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json"

Ubuntu:22.04:LTS

haproxy

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.4.30-0ubuntu0.22.04.2

Affected versions

2.*

2.2.9-2ubuntu2

2.4.8-1

2.4.8-2ubuntu3

2.4.11-1ubuntu1

2.4.12-1ubuntu1

2.4.12-1ubuntu2

2.4.13-1ubuntu1

2.4.14-1ubuntu1

2.4.18-0ubuntu1

2.4.18-0ubuntu1.1

2.4.18-0ubuntu1.2

2.4.18-0ubuntu1.3

2.4.22-0ubuntu0.22.04.1

2.4.22-0ubuntu0.22.04.2

2.4.22-0ubuntu0.22.04.3

2.4.24-0ubuntu0.22.04.1

2.4.24-0ubuntu0.22.04.2

2.4.24-0ubuntu0.22.04.3

2.4.29-0ubuntu0.22.04.1

2.4.30-0ubuntu0.22.04.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.4.30-0ubuntu0.22.04.2",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "2.4.30-0ubuntu0.22.04.2",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json"

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

2.8.16-0ubuntu0.24.04.3

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

2.8.16-0ubuntu0.24.04.2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.8.16-0ubuntu0.24.04.3",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "2.8.16-0ubuntu0.24.04.3",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.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

3.0.12-0ubuntu0.25.10.5

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

3.0.12-0ubuntu0.25.10.4

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.0.12-0ubuntu0.25.10.5",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "3.0.12-0ubuntu0.25.10.5",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.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

3.2.9-1ubuntu2.2

Affected versions

3.*

3.0.10-1ubuntu3

3.2.9-1ubuntu1

3.2.9-1ubuntu2

3.2.9-1ubuntu2.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.2.9-1ubuntu2.2",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "3.2.9-1ubuntu2.2",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json"

Ubuntu:Pro:16.04:LTS

haproxy

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.5.14-1

1.5.15-1

1.6.2-1

1.6.2-2

1.6.2-2ubuntu1

1.6.2-2ubuntu3

1.6.3-1

1.6.3-1ubuntu0.1

1.6.3-1ubuntu0.2

1.6.3-1ubuntu0.3

1.6.3-1ubuntu0.3+esm1

1.6.3-1ubuntu0.3+esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.6.3-1ubuntu0.3+esm2",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "1.6.3-1ubuntu0.3+esm2",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json"

Ubuntu:Pro:18.04:LTS

haproxy

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7.9-1ubuntu1

1.7.9-1ubuntu2

1.8.4-1

1.8.7-1

1.8.8-1

1.8.8-1ubuntu0.1

1.8.8-1ubuntu0.2

1.8.8-1ubuntu0.3

1.8.8-1ubuntu0.4

1.8.8-1ubuntu0.6

1.8.8-1ubuntu0.7

1.8.8-1ubuntu0.8

1.8.8-1ubuntu0.9

1.8.8-1ubuntu0.10

1.8.8-1ubuntu0.11

1.8.8-1ubuntu0.13

1.8.8-1ubuntu0.13+esm2

1.8.8-1ubuntu0.13+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.8.8-1ubuntu0.13+esm3",
            "binary_name": "haproxy"
        },
        {
            "binary_version": "1.8.8-1ubuntu0.13+esm3",
            "binary_name": "vim-haproxy"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55204.json"