CVE-2026-45078

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Source
https://cve.org/CVERecord?id=CVE-2026-45078
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45078.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45078
Aliases
Downstream
Related
Published
2026-05-28T15:52:04.765Z
Modified
2026-07-15T01:49:12.049462613Z
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
Summary
Synapse CPU starvation (Denial of Service)
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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45078.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ]
}
References

Affected packages

Git / github.com/element-hq/synapse

Affected ranges

Type
GIT
Repo
https://github.com/element-hq/synapse
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d97b5b9e21681792d78c5d58243fc483c664b66e
Database specific 
{
    "cpe": "cpe:2.3:a:element:synapse:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.152.1"
        }
    ]
}

Affected versions

Other
hhs-1
hhs-2
hhs-3
hhs-5
hhs-6
hhs-7
hhs-8
v0.*
v0.10.0
v0.10.0-r1
v0.10.0-r2
v0.11.0
v0.11.0-r1
v0.11.0-r2
v0.11.1
v0.12.0
v0.13.1
v0.13.2
v0.13.3
v0.14.0
v0.16.0
v0.16.1
v0.16.1-r1
v0.17.0
v0.17.1
v0.17.2
v0.17.3
v0.18.0
v0.18.1
v0.18.2
v0.18.3
v0.18.4
v0.18.5
v0.2.0
v0.2.1
v0.2.1a
v0.2.2
v0.23.0-rc1
v0.23.0-rc2
v0.25.0-rc1
v0.28.0-rc1
v0.3.0
v0.3.3
v0.3.4
v0.32.0
v0.32.0rc1
v0.32.2
v0.4.1
v0.4.2
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.3a
v0.5.3b
v0.5.3c
v0.5.4
v0.5.4a
v0.6.0
v0.6.0a
v0.6.0b
v0.6.1
v0.6.1a
v0.6.1b
v0.6.1c
v0.6.1d
v0.6.1e
v0.6.1f
v0.7.0
v0.7.0a
v0.7.0b
v0.7.0c
v0.7.0d
v0.7.0e
v0.7.0f
v0.7.1
v0.7.1-r1
v0.7.1-r2
v0.7.1-r3
v0.7.1-r4
v0.8.0
v0.8.1
v0.8.1-r1
v0.8.1-r2
v0.8.1-r3
v0.8.1-r4
v0.9.0
v0.9.0-r1
v0.9.0-r2
v0.9.0-r3
v0.9.0-r4
v0.9.0-r5
v0.9.1
v0.9.2
v0.9.2-r1
v0.9.2-r2
v0.9.3
v0.99.1rc1
v0.99.2rc1
v0.99.4rc1
v0.99.5.1.dev0
v1.*
v1.1.0rc1
v1.1.0rc2
v1.10.0rc1
v1.100.0rc1
v1.100.0rc2
v1.100.0rc3
v1.101.0rc1
v1.103.0rc1
v1.104.0rc1
v1.105.0rc1
v1.106.0rc1
v1.11.0rc1
v1.111.0rc1
v1.112.0rc1
v1.114.0rc1
v1.115.0rc1
v1.116.0rc1
v1.12.0rc1
v1.121.0rc1
v1.123.0rc1
v1.124.0rc1
v1.126.0rc1
v1.126.0rc2
v1.126.0rc3
v1.127.0rc1
v1.128.0rc1
v1.130.0rc1
v1.133.0rc1
v1.135.0rc1
v1.136.0rc1
v1.137.0rc1
v1.138.0rc1
v1.14.0rc1
v1.142.0rc1
v1.142.0rc2
v1.142.0rc3
v1.143.0rc1
v1.143.0rc2
v1.146.0rc1
v1.147.0rc1
v1.15.0rc1
v1.150.0rc1
v1.151.0rc1
v1.152.0
v1.152.0rc1
v1.16.0rc1
v1.17.0rc1
v1.18.0rc1
v1.23.0rc1
v1.24.0rc1
v1.27.0rc1
v1.29.0rc1
v1.3.0rc1
v1.30.0rc1
v1.31.0rc1
v1.32.0rc1
v1.34.0rc1
v1.35.0rc1
v1.36.0rc1
v1.4.0rc1
v1.40.0rc1
v1.49.0rc1
v1.5.0rc1
v1.52.0rc1
v1.6.0rc1
v1.62.0rc1
v1.63.0rc1
v1.75.0rc1
v1.76.0rc1
v1.78.0rc1
v1.79.0rc1
v1.8.0rc1
v1.81.0rc1
v1.84.0rc1
v1.87.0rc1
v1.88.0rc1
v1.9.0.dev1
v1.9.0.dev2
v1.9.0rc1
v1.90.0rc1
v1.94.0rc1
v1.95.0rc1
v1.98.0rc1
v1.99.0rc1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45078.json"