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Vulnerability record · CVE-2025-68475 · published 22 December 2025

CVE-2025-68475: Fedify inefficient regular expression (redos) vulnerability

Fedify · Fedify

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.

7.5 CVSS 3.1 High EPSS 0.56% · top 55.6% CWE-1333 · Inefficient regular expression (ReDoS)
7.5CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc5488779 Patch
https://github.com/fedify-dev/fedify/commit/bf2f0783634efed2663d1b187dc55461ee1f987a Patch
https://github.com/fedify-dev/fedify/releases/tag/1.6.13 ProductRelease Notes
https://github.com/fedify-dev/fedify/releases/tag/1.7.14 ProductRelease Notes
https://github.com/fedify-dev/fedify/releases/tag/1.8.15 ProductRelease Notes
https://github.com/fedify-dev/fedify/releases/tag/1.9.2 ProductRelease Notes
https://github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-68475), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.