Fedify has ReDoS Vulnerability in HTML Parsing Regex
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
exploitation probability
0.5%top 61% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
fedify-dev · fedifyReferences
https://github.com/fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc5488779https://github.com/fedify-dev/fedify/commit/bf2f0783634efed2663d1b187dc55461ee1f987ahttps://github.com/fedify-dev/fedify/releases/tag/1.6.13https://github.com/fedify-dev/fedify/releases/tag/1.7.14https://github.com/fedify-dev/fedify/releases/tag/1.8.15https://github.com/fedify-dev/fedify/releases/tag/1.9.2https://github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93