CVE-2024-52805

Synapse allows unsupported content types to lead to memory exhaustion

HIGH
7.5
CVSS Score
Published: December 3, 2024 at 05:01 PM UTC
Updated: June 17, 2026 at 08:07 AM UTC
2 products affected across 2 vendorsSynapseSynapse

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Synapse 1.120.1 resolves the issue by denying requests with unsupported multipart/form-data content type.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.120.1
Affected range stops below 1.120.1, so it looks safe — our inference, not a vendor statement
v < 1.120.1
Affected range stops below 1.120.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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