Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders

ImpactIn Synapse versions before 1.120.1, enabling the dynamicthumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoking external tools like Ghostscript for processing.This significantly expands t...

PYSEC-2026-1611 Synapse allows a a malformed invite to break the invitee's `/sync`

Impact Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Patches Synapse 1.120.1 rejects such invalid invites received ov...

PYSEC-2026-1610 Synapse Matrix has a partial room state leak via Sliding Sync

Impact The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. Patches Synapse version 1.120.1 fixes the problem. Workarounds Disable Sliding Sync. References...

PYSEC-2026-1613 Synapse allows unsupported content types to lead to memory exhaustion

Impact 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. Patches Synapse 1.120.1 resolves the issue by denying...

Synapse allows a a malformed invite to break the invitee's `/sync`

ImpactSynapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. PatchesSynapse 1.120.1 rejects such invalid invites received over...

PYSEC-2026-1615 Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders

Impact In Synapse versions before 1.120.1, enabling the dynamicthumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoking external tools like Ghostscript for processing. This significantly expands...

PYSEC-2026-846 Matrix Synapse DoS

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 263 - 1 render rooms unusable, related to federation/federationbase.py and handlers/message.py, as exploited in the wild in April 2018...

Matrix Synapse DoS

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 263 - 1 render rooms unusable, related to federation/federationbase.py and handlers/message.py, as exploited in the wild in April 2018...

Matrix Synapse Improper Signature Validation

Matrix Synapse before 0.33.3.1 and 0.33.2.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation...

Matrix Synapse Authorization Error

In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.powerlevels event in force...

PYSEC-2026-845 Matrix Synapse Improper Signature Validation

Matrix Synapse before 0.33.3.1 and 0.33.2.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation...

PYSEC-2026-844 Matrix Synapse Authorization Error

In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.powerlevels event in force...

EUVD-2026-41444

Improper access control in Azure Synapse allows an authorized attacker to elevate privileges over a network...

CVE-2026-26145

Improper access control in Azure Synapse allows an authorized attacker to elevate privileges over a network...

CVE-2026-26145 Microsoft Azure Synapse Elevation of Privilege Vulnerability

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CVE-2026-26145 Microsoft Azure Synapse Elevation of Privilege Vulnerability

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CVE-2026-26145

Improper access control in Azure Synapse allows an authorized attacker to elevate privileges over a network...

CVE-2026-26145

CVE-2026-26145 concerns Microsoft Azure Synapse with an elevation-of-privilege flaw caused by improper access control. Affected software is Azure Synapse; the core issue is inadequate access controls that permit an authorized attacker to elevate privileges over a network. The public-facing materi...

Matrix Synapse Security Filtering Flaw

The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissingevents federation API where event visibility rules were not applied correctly...

PYSEC-2026-664 Matrix Synapse Security Filtering Flaw

The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissingevents federation API where event visibility rules were not applied correctly...