Vulnerability in Fedify
CVE-2025-68475
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Fedify
- Fedify-Dev Fedify — versions < 1.6.13, >= 1.7.0, < 1.7.14, >= 1.8.0, < 1.8.15
Weakness classification (CWE)
References
- github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93 (Exploit, Mitigation, Vendor Advisory)
- github.com/fedify-dev/fedify/commit/2bdcb24d7d6d5886e0214ed504b63a6dc5488779 (Patch)
- github.com/fedify-dev/fedify/commit/bf2f0783634efed2663d1b187dc55461ee1f987a (Patch)
- github.com/fedify-dev/fedify/releases/tag/1.6.13 (Product, Release Notes)
- github.com/fedify-dev/fedify/releases/tag/1.7.14 (Product, Release Notes)
- github.com/fedify-dev/fedify/releases/tag/1.8.15 (Product, Release Notes)
- github.com/fedify-dev/fedify/releases/tag/1.9.2 (Product, Release Notes)
Frequently asked questions
- What is CVE-2025-68475?
- CVE-2025-68475 is a high-severity vulnerability in Fedify, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2025-12-22.
- How severe is CVE-2025-68475?
- High severity. CVSS v3 base score is 7.5 out of 10.