UBUNTU-CVE-2026-45078

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Source
https://ubuntu.com/security/CVE-2026-45078
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45078.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45078
Upstream
Published
2026-05-28T17:16:00Z
Modified
2026-06-04T12:45:34.960257899Z
Severity
  • 6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.

References

Affected packages

Ubuntu:Pro:18.04:LTS / matrix-synapse

Package

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

Affected ranges

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

Affected versions

0.*
0.19.2+dfsg-6
0.24.0+dfsg-1
0.24.0+dfsg-1ubuntu0.1~esm1
0.24.0+dfsg-1ubuntu0.1~esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "matrix-synapse",
            "binary_version": "0.24.0+dfsg-1ubuntu0.1~esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45078.json"

Ubuntu:Pro:20.04:LTS / matrix-synapse

Package

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

Affected ranges

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

Affected versions

1.*
1.3.0-1
1.4.0-1
1.5.0-1
1.5.1-1
1.6.0-1
1.6.1-1
1.7.0-2
1.7.1-1
1.7.2-1
1.7.3-1
1.8.0-1
1.9.0-1
1.9.1-1
1.10.0-1
1.10.0-2
1.11.0-1
1.11.0-1ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "matrix-synapse",
            "binary_version": "1.11.0-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45078.json"

Ubuntu:Pro:22.04:LTS / matrix-synapse

Package

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

Affected ranges

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

Affected versions

1.*
1.39.0-1
1.47.0-2
1.47.1-1
1.48.0-1
1.49.0-1
1.49.2-1
1.50.1-1
1.50.2-1
1.51.0-1
1.52.0-1
1.53.0-1
1.53.0-1ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "matrix-synapse",
            "binary_version": "1.53.0-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45078.json"

Ubuntu:24.04:LTS / matrix-synapse

Package

Name
matrix-synapse
Purl
pkg:deb/ubuntu/matrix-synapse?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.90.0-1
1.100.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "matrix-synapse",
            "binary_version": "1.100.0-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45078.json"