GHSA-vc2m-hw89-qjxf · 深刻度： medium · エコシステム： go — matrix-media-repo (MMR) allows denial of service/high operating costs through unauthenticated downloads
Matrix Media Repo (MMR) is a highly configurable multi-homeserver media repository for Matrix. MMR before version 1.3.5 is vulnerable to unbounded disk consumption, where an unauthenticated adversary can induce it to download and cache large amounts of remote media files. MMR's typical operating environment uses S3-like storage as a backend, with file-backed store as an alternative option. Instances using a file-backed store or those which self-host an S3 storage system are therefore vulnerable to a disk fill attack. Once the disk is full, authenticated users will be unable to upload new media, resulting in denial of service. For instances configured to use a cloud-based S3 storage option, this could result in high service fees instead of a denial of service. MMR 1.3.5 introduces a new default-on "leaky bucket" rate limit 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. Operators should note that the leaky bucket implementation introduced in MMR 1.3.5 requires the IP address associated with the request to be forwarded, to avoid mistakenly applying the rate limit to the reverse proxy instead. To avoid this issue, the reverse proxy should populate the X-Forwarded-For header when sending the request to MMR. Operators who cannot update may wish to lower the maximum file size they allow and implement harsh rate limits, though this can still lead to a large amount of data to be downloaded.
総合評価: CVE-2024-36403 は低リスク（38.3/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.68%、47 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.06% | 0.68% | +0.61% |
| 2 | 2026-02-24 | 0.44% | 0.06% | -0.38% |
| 3 | 2025-12-16 | — | 0.44% | — |
EPSS の全履歴 （全 14 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-vc2m-hw89-qjxf · 深刻度： medium · エコシステム： go — matrix-media-repo (MMR) allows denial of service/high operating costs through unauthenticated downloads
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| t2bot | matrix-media-repo | < 1.3.5 | cpe:2.3:a:t2bot:matrix-media-repo:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://en.wikipedia.org/wiki/Leaky_bucket#As_a_meter | Technical Description |
| https://github.com/t2bot/matrix-media-repo/security/advisories/GHSA-vc2m-hw89-qjxf | Vendor Advisory |