CVE-2025-68475

Fedify has ReDoS Vulnerability in HTML Parsing Regex

Published Dec 22, 2025 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-rchf-xwx2-hm93 Fedify has ReDoS Vulnerability in HTML Parsing Regex
History
Type Values Removed Values Added
First Time appeared Fedify
Fedify fedify
CPEs cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:*
Vendors & Products Fedify
Fedify fedify
Type Values Removed Values Added
First Time appeared Fedify Project
Fedify Project fedify
Vendors & Products Fedify Project
Fedify Project fedify
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Fedify has ReDoS Vulnerability in HTML Parsing Regex
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 22, 2025, 9:54 PM
Reserved
Dec 18, 2025, 1:52 PM
Status
Analyzed
Published
Dec 22, 2025, 10:16 PM
Modified
Sep 28, 2026, 10:10 AM