GHSA-4822-jvwx-w47h · 深刻度: medium · エコシステム: pip — Uncontrolled Resource Consumption in Matrix Synapse
Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic and connections toward such servers if their stream URL is, for example, posted to a large room with many Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not supported and always fails, 1.53.0 additionally implements an allow list for content types for which Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse configuration file.
総合評価: CVE-2022-41952 は中リスク(44.7/100)。CVSS 深刻度は中。悪用される可能性が高い(EPSS 0.83%、53 パーセンタイル) 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
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 | 0.55% | 0.83% | +0.27% |
| 2 | 2026-05-18 | 0.53% | 0.55% | +0.02% |
| 3 | 2025-11-23 | — | 0.53% | — |
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 |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
3.9 | 2.5 | [email protected] |
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
GHSA-4822-jvwx-w47h · 深刻度: medium · エコシステム: pip — Uncontrolled Resource Consumption in Matrix Synapse
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2022-41952: 1 source package rows (synapse); 14 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 14. | https://security.alpinelinux.org/vuln/CVE-2022-41952 |
debian
|
not yet assigned | CVE-2022-41952 not yet assigned priority: Debian including 1 source packages (matrix-synapse), 2 status rows across 2 suites (forky, sid): resolved 2. | https://security-tracker.debian.org/tracker/CVE-2022-41952 |
ubuntu
|
medium | CVE-2022-41952 medium priority: Ubuntu including 1 source packages (matrix-synapse), 11 status rows across 11 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): not-affected 6, ignored 2, needs-triage 2, released 1. | https://ubuntu.com/security/CVE-2022-41952 |
| URL | タグ |
|---|---|
| https://github.com/matrix-org/synapse/pull/11784 | Patch Third Party Advisory |
| https://github.com/matrix-org/synapse/pull/11936 | Patch Third Party Advisory |
| https://github.com/matrix-org/synapse/releases/tag/v1.52.0 | Release Notes Third Party Advisory |
| https://github.com/matrix-org/synapse/releases/tag/v1.53.0 | Release Notes Third Party Advisory |
| https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h | Mitigation Third Party Advisory |