CVE-2025-68475

Fedify has ReDoS Vulnerability in HTML Parsing Regex

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.

Affected

fedify-dev · fedify

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.56% chance of exploitation in the next 30 days, 45th percentile

Published

2025-12-22

Proof-of-concept exploits (1)

• advisories/GHSA-rchf-xwx2-hm93

Security advisories

• fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93
• fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc5488779

References

• CVE Record
• NVD entry