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CVE-2026-45078

21
FAUCET Score

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.

First published: May 28, 2026Last modified: May 28, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.152.1CPE matchmatch criteria
cpe:2.3:a:element:synapse:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.8MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.13%
Probability of exploitation in next 30 days
EPSS Percentile
2.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0013 is in the 19th percentile among its peer group of 15,938 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

pippatch availablevia ghsa
Product: matrix-synapseFixed in: 1.152.1
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-8q93-326v-3m7ghigh

Synapse CPU starvation (Denial of Service)

May 14, 2026

References

github.com / element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g
MitigationVendor Advisory