| Summary | Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1. |
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| Publication Date | April 7, 2026, 1:16 a.m. |
| Registration Date | April 15, 2026, 11:27 a.m. |
| Last Update | April 14, 2026, 10:58 a.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.5 |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 不要 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更なし |
| 機密性への影響(C) | なし |
| 完全性への影響(I) | なし |
| 可用性への影響(A) | 高 |
| Configuration1 | or higher | or less | more than | less than | |
| cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* | 1.9.5 | ||||
| cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* | 1.9.7 | 1.10.4 | |||
| cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* | 1.10.6 | 2.0.7 | |||
| cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* | 2.0.9 | 2.1.0 | |||
| cpe:2.3:a:fedify:vocab-runtime:*:*:*:*:*:*:*:* | 2.0.8 | ||||
| cpe:2.3:a:fedify:vocab-runtime:2.1.0:*:*:*:*:*:*:* | |||||