PYSEC-2024-286
Vulnerability from pysec - Published: 2024-12-03 17:15 - Updated: 2026-05-20 09:19
VLAI
Details
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.
Severity
7.5 (High)
Impacted products
| Name | purl | matrix-synapse | pkg:pypi/matrix-synapse |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "matrix-synapse",
"purl": "pkg:pypi/matrix-synapse"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.106.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"0.33.5.1",
"0.33.6",
"0.33.6rc1",
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"0.34.1.1",
"0.99.0",
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]
}
],
"aliases": [
"CVE-2024-37302",
"GHSA-4mhg-xv73-xq2x"
],
"details": "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\u0027s ability to request large amounts of data to be cached.",
"id": "PYSEC-2024-286",
"modified": "2026-05-20T09:19:06.777355Z",
"published": "2024-12-03T17:15:10.733Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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