UBUNTU-CVE-2026-4271

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Source
https://ubuntu.com/security/CVE-2026-4271
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4271.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4271
Upstream
  • CVE-2026-4271
Published
2026-03-17T12:16:00Z
Modified
2026-07-10T02:26:41Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 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
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).

References

Affected packages

Ubuntu:Pro:22.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.4-2
3.0.4-3
3.0.5-1
3.0.7-0ubuntu1
3.0.7-0ubuntu1+esm1
3.0.7-0ubuntu1+esm2
3.0.7-0ubuntu1+esm3
3.0.7-0ubuntu1+esm4
3.0.7-0ubuntu1+esm5
3.0.7-0ubuntu1+esm6
3.0.7-0ubuntu1+esm7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.0.7-0ubuntu1+esm7"
        },
        {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.0.7-0ubuntu1+esm7"
        },
        {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.0.7-0ubuntu1+esm7"
        },
        {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.0.7-0ubuntu1+esm7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4271.json"

Ubuntu:24.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.4.2-4
3.4.4-1
3.4.4-2
3.4.4-4
3.4.4-5
3.4.4-5build1
3.4.4-5build2
3.4.4-5ubuntu0.1
3.4.4-5ubuntu0.2
3.4.4-5ubuntu0.3
3.4.4-5ubuntu0.4
3.4.4-5ubuntu0.5
3.4.4-5ubuntu0.6
3.4.4-5ubuntu0.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.4.4-5ubuntu0.7"
        },
        {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.4.4-5ubuntu0.7"
        },
        {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.4.4-5ubuntu0.7"
        },
        {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.4.4-5ubuntu0.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4271.json"

Ubuntu:25.10 / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.6.5-1
3.6.5-1ubuntu1
3.6.5-3
3.6.5-4
3.6.5-4ubuntu0.1
3.6.5-4ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.6.5-4ubuntu0.2"
        },
        {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.6.5-4ubuntu0.2"
        },
        {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.6.5-4ubuntu0.2"
        },
        {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.6.5-4ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4271.json"

Ubuntu:26.04:LTS / libsoup3

Package

Name
libsoup3
Purl
pkg:deb/ubuntu/libsoup3?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.6.5-4
3.6.5-5
3.6.5-6
3.6.5-7
3.6.5-9
3.6.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gir1.2-soup-3.0",
            "binary_version": "3.6.6-1"
        },
        {
            "binary_name": "libsoup-3.0-0",
            "binary_version": "3.6.6-1"
        },
        {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.6.6-1"
        },
        {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.6.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4271.json"