Description
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2, a Regular Expression Denial of Service (ReDoS) vulnerability exists in Fedify's document loader. The HTML parsing regex at packages/fedify/src/runtime/docloader.ts:259 contains nested quantifiers that cause catastrophic backtracking when processing maliciously crafted HTML responses. This issue has been patched in versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2.
Scores
CVSS v3
7.5
EPSS
0.0043
EPSS Percentile
62.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (6)
fedify/fedify
< 1.6.13
fedify/fedify
0 - 1.6.13npm
fedify-dev/fedify
< 1.6.13
fedify-dev/fedify
>= 1.7.0, < 1.7.14
fedify-dev/fedify
>= 1.8.0, < 1.8.15
fedify-dev/fedify
>= 1.9.0, < 1.9.2
Published
Dec 22, 2025
Tracked Since
Feb 18, 2026