Fedify has ReDoS Vulnerability in HTML Parsing Regex

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-68475
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-22 22:16:09 UTC
Updated2026-09-28 10:10:00 UTC
DescriptionFedify 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-1333 | CWE-1333 CWE-1333: Inefficient Regular Expression Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Fedify Fedify All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fedify-dev Fedify affected < 1.6.13 Not specified
CNA Fedify-dev Fedify affected >= 1.7.0, < 1.7.14 Not specified
CNA Fedify-dev Fedify affected >= 1.8.0, < 1.8.15 Not specified
CNA Fedify-dev Fedify affected >= 1.9.0, < 1.9.2 Not specified

References

ReferenceSourceLinkTags
github.com/fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc548... [email protected] github.com Patch
github.com/fedify-dev/fedify/releases/tag/1.9.2 [email protected] github.com Product, Release Notes
github.com/fedify-dev/fedify/commit/bf2f0783634efed2663d1b187dc55461ee1f... [email protected] github.com Patch
github.com/fedify-dev/fedify/releases/tag/1.7.14 [email protected] github.com Product, Release Notes
github.com/fedify-dev/fedify/releases/tag/1.6.13 [email protected] github.com Product, Release Notes
github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93 [email protected] github.com Exploit, Mitigation, Vendor Advisory
github.com/fedify-dev/fedify/releases/tag/1.8.15 [email protected] github.com Product, Release Notes
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