USN-8893-1

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Source
https://ubuntu.com/security/notices/USN-8893-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8893-1
Upstream
Related
Published
2026-10-07T10:05:38Z
Modified
2026-10-08T12:58:05Z
Summary
libwebsockets vulnerabilities
Details

It was discovered that libwebsockets did not properly validate user-supplied data when parsing HTTP/2 HPACK path headers, which could result in a write past the end of an allocated buffer. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-19773)

It was discovered that libwebsockets did not properly handle CBOR recording in the LECP parser, which could result in a write past the end of an allocated buffer. An attacker could possibly use this issue to cause a crash or execute arbitrary code. (CVE-2026-78161)

References

Affected packages

Ubuntu:Pro:16.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.7.1-1ubuntu0.1~esm1

Affected versions

1.*
1.2.2-1
1.6.0-3
1.6.0-4
1.6.0-5
1.6.1-1
1.7.0-1ubuntu1
1.7.0-2
1.7.1-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "1.7.1-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "1.7.1-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "libwebsockets7",
            "binary_version": "1.7.1-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"
Ubuntu:Pro:18.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.3-3ubuntu0.1~esm1

Affected versions

2.*
2.0.3-3
2.0.3-3build1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "2.0.3-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "2.0.3-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "libwebsockets8",
            "binary_version": "2.0.3-3ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"
Ubuntu:Pro:20.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.2.1-3ubuntu0.1~esm3

Affected versions

2.*
2.0.3-3build1
3.*
3.2.1-3
3.2.1-3ubuntu0.1~esm1
3.2.1-3ubuntu0.1~esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "3.2.1-3ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "3.2.1-3ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets15",
            "binary_version": "3.2.1-3ubuntu0.1~esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"
Ubuntu:Pro:22.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.0.20-2ubuntu1.1+esm2

Affected versions

4.*
4.0.20-2
4.0.20-2ubuntu1
4.0.20-2ubuntu1.1
4.0.20-2ubuntu1.1+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "4.0.20-2ubuntu1.1+esm2"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "4.0.20-2ubuntu1.1+esm2"
        },
        {
            "binary_name": "libwebsockets16",
            "binary_version": "4.0.20-2ubuntu1.1+esm2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"
Ubuntu:Pro:24.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.3-1.1ubuntu0.1~esm3

Affected versions

4.*
4.3.2-4
4.3.3-1
4.3.3-1.1build1
4.3.3-1.1build2
4.3.3-1.1build3
4.3.3-1.1ubuntu0.1~esm1
4.3.3-1.1ubuntu0.1~esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-evlib-ev",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets-evlib-glib",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets-evlib-uv",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libwebsockets19t64",
            "binary_version": "4.3.3-1.1ubuntu0.1~esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"
Ubuntu:Pro:26.04:LTS
libwebsockets

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.5-3ubuntu1.2+esm1

Affected versions

4.*
4.3.5-1
4.3.5-3
4.3.5-3ubuntu1
4.3.5-3ubuntu1.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libwebsockets-evlib-ev",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libwebsockets-evlib-glib",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libwebsockets-evlib-uv",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libwebsockets-test-server",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libwebsockets-test-server-common",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        },
        {
            "binary_name": "libwebsockets19t64",
            "binary_version": "4.3.5-3ubuntu1.2+esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-19773",
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"