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| purl | pkg:pypi/matrix-synapse@1.47.0rc2 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-2q41-366b-jfbs
Aliases: CVE-2023-32683 GHSA-98px-6486-j7qc PYSEC-2023-85 |
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the `url_preview_enabled` setting) or have not configured a `url_preview_url_blacklist` are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews. |
Affected by 14 other vulnerabilities. |
|
VCID-2uq2-kcfr-87gr
Aliases: CVE-2023-32682 GHSA-26c5-ppr8-f33p PYSEC-2023-84 |
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. In affected versions it may be possible for a deactivated user to login when using uncommon configurations. This only applies if any of the following are true: 1. JSON Web Tokens are enabled for login via the `jwt_config.enabled` configuration setting. 2. The local password database is enabled via the `password_config.enabled` and `password_config.localdb_enabled` configuration settings *and* a user's password is updated via an admin API after a user is deactivated. Note that the local password database is enabled by default, but it is uncommon to set a user's password after they've been deactivated. Installations that are configured to only allow login via Single Sign-On (SSO) via CAS, SAML or OpenID Connect (OIDC); or via an external password provider (e.g. LDAP) are not affected. If not using JSON Web Tokens, ensure that deactivated users do not have a password set. This issue has been addressed in version 1.85.0. Users are advised to upgrade. |
Affected by 14 other vulnerabilities. |
|
VCID-361n-7ar1-fqgr
Aliases: CVE-2025-61672 GHSA-fh66-fcv5-jjfr |
Synapse's invalid device keys degrade federation functionality Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. |
Affected by 2 other vulnerabilities. Affected by 2 other vulnerabilities. |
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VCID-3gx5-a6ja-eyhc
Aliases: CVE-2024-52805 GHSA-rfq8-j7rh-8hf2 |
Synapse allows unsupported content types to lead to memory exhaustion 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. |
Affected by 0 other vulnerabilities. |
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VCID-44n9-z1mc-fydq
Aliases: CVE-2026-45076 CVE-2026-45076, GHSA-6qf2-7x63-mm6v PYSEC-2026-194 |
Synapse pagination Denial of Service ### Impact In federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. ### Patches Update to Synapse 1.152.1 or later. ### Workarounds There are no known workarounds for this issue. ### Identifiers - ELEMENTSEC-2025-1636 ### For more information If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io). |
Affected by 0 other vulnerabilities. |
|
VCID-4vve-jkk2-rueg
Aliases: CVE-2023-43796 GHSA-mp92-3jfm-3575 PYSEC-2023-230 |
Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver. |
Affected by 10 other vulnerabilities. |
|
VCID-57xv-u1be-mfez
Aliases: CVE-2026-45078 CVE-2026-45078, GHSA-8q93-326v-3m7g PYSEC-2026-191 |
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. |
Affected by 0 other vulnerabilities. |
|
VCID-8vfd-w1xq-wuf9
Aliases: CVE-2024-53863 GHSA-vp6v-whfm-rv3g |
Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders In Synapse versions before 1.120.1, enabling the `dynamic_thumbnails` 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 the attack surface in a historically vulnerable area, presenting a risk that far outweighs the benefit, particularly since these formats are rarely used on the open web or within the Matrix ecosystem. For a list of image formats, as well as decoding libraries and helper programs used, see [the Pillow documentation](https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html). |
Affected by 0 other vulnerabilities. |
|
VCID-8zas-gnpp-3qfd
Aliases: CVE-2023-42453 GHSA-7565-cq32-vx2x PYSEC-2023-180 |
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room. This issue has been patched in version 1.93.0. Users are advised to upgrade. There are no known workarounds for this issue. |
Affected by 12 other vulnerabilities. |
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VCID-9t8r-dp58-xydr
Aliases: CVE-2024-31208 GHSA-3h7q-rfh9-xm4v PYSEC-2024-50 |
Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API. |
Affected by 9 other vulnerabilities. |
|
VCID-bnz6-nw3z-77gd
Aliases: CVE-2022-39335 GHSA-45cj-f97f-ggwv PYSEC-2023-65 |
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade. |
Affected by 17 other vulnerabilities. |
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VCID-djck-vkte-q7he
Aliases: CVE-2022-31052 GHSA-22p3-qrh9-cx32 PYSEC-2022-224 |
Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with `url_preview_enabled: false` set in configuration are not affected. Deployments with `url_preview_enabled: true` set in configuration **are** affected. Deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`. Administrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher. Users unable to upgrade should set `url_preview_enabled` to false. |
Affected by 18 other vulnerabilities. |
|
VCID-ewxj-3jt9-p7af
Aliases: CVE-2024-37303 GHSA-gjgr-7834-rhxr PYSEC-2024-287 |
Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The implication is that unauthenticated remote adversaries can use this functionality to plant problematic content into the media repository. Synapse 1.106 introduces a partial mitigation in the form of new endpoints which require authentication for media downloads. The unauthenticated endpoints will be frozen in a future release, closing the attack vector. |
Affected by 0 other vulnerabilities. Affected by 7 other vulnerabilities. |
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VCID-ftmr-xpa4-mbfd
Aliases: CVE-2021-41281 GHSA-3hfw-x7gx-437c PYSEC-2021-436 |
directory traversal |
Affected by 19 other vulnerabilities. |
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VCID-gre7-9vu7-vqdh
Aliases: CVE-2022-31152 GHSA-jhjh-776m-4765 GMS-2022-3903 PYSEC-2022-262 |
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround. |
Affected by 18 other vulnerabilities. Affected by 18 other vulnerabilities. |
|
VCID-hnm3-rn4r-1qa4
Aliases: CVE-2025-30355 GHSA-v56r-hwv5-mxg6 |
Synapse vulnerable to federation denial of service via malformed events A malicious server can craft events with a `depth` outside the integer range allowed by Canonical JSON. When such an event is received by Synapse version up to 1.127.0, it prevents it from federating with other servers. The vulnerability has been exploited in the wild. |
Affected by 3 other vulnerabilities. |
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VCID-mgxc-w86p-yqcm
Aliases: CVE-2023-45129 GHSA-5chr-wjw5-3gq4 PYSEC-2023-199 |
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API. |
Affected by 11 other vulnerabilities. |
|
VCID-mxt4-9769-pkd5
Aliases: CVE-2024-52815 GHSA-f3r3-h2mq-hx2h |
Synapse allows a a malformed invite to break the invitee's `/sync` 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. |
Affected by 0 other vulnerabilities. |
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VCID-ubx5-xans-8bey
Aliases: CVE-2023-32323 GHSA-f3wc-3vxv-xmvr PYSEC-2023-67 |
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently. |
Affected by 16 other vulnerabilities. |
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VCID-z4xn-smp8-tfcj
Aliases: CVE-2024-37302 GHSA-4mhg-xv73-xq2x PYSEC-2024-286 |
Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached. |
Affected by 0 other vulnerabilities. Affected by 7 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| This package is not known to fix vulnerabilities. | ||