Fedify has ReDoS Vulnerability in HTML Parsing Regex
Priority HIGH 72CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00559 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fedify (fedify-dev): 1.6.13, 1.7.14, 1.8.15 +1@fedify/fedify (npm): 1.6.13, 1.7.14, 1.8.15 +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fedify-dev | fedify | before 1.6.13; 1.7.0 to before 1.7.14; 1.8.0 to before 1.8.15; 1.9.0 to before 1.9.2 | 1.6.13, 1.7.14, 1.8.15, 1.9.2 | Patch available | CNA |
| — | @fedify/fedify (npm) | before 1.6.13 | 1.6.13 | Patch available | GHSA-rchf-xwx2-hm93 |
| — | @fedify/fedify (npm) | 1.7.0 to before 1.7.14 | 1.7.14 | Patch available | GHSA-rchf-xwx2-hm93 |
| — | @fedify/fedify (npm) | 1.8.0 to before 1.8.15 | 1.8.15 | Patch available | GHSA-rchf-xwx2-hm93 |
| — | @fedify/fedify (npm) | 1.9.0 to before 1.9.2 | 1.9.2 | Patch available | GHSA-rchf-xwx2-hm93 |
- fedify Vendorfedify-dev Affected before 1.6.13; 1.7.0 to before 1.7.14; 1.8.0 to before 1.8.15; 1.9.0 to before 1.9.2 Fixed in 1.6.13, 1.7.14, 1.8.15, 1.9.2 Patch available CNA
- @fedify/fedify (npm) Vendor— Affected before 1.6.13 Fixed in 1.6.13 Patch available GHSA-rchf-xwx2-hm93
- @fedify/fedify (npm) Vendor— Affected 1.7.0 to before 1.7.14 Fixed in 1.7.14 Patch available GHSA-rchf-xwx2-hm93
- @fedify/fedify (npm) Vendor— Affected 1.8.0 to before 1.8.15 Fixed in 1.8.15 Patch available GHSA-rchf-xwx2-hm93
- @fedify/fedify (npm) Vendor— Affected 1.9.0 to before 1.9.2 Fixed in 1.9.2 Patch available GHSA-rchf-xwx2-hm93
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* | before 1.6.13; 1.7.0 to before 1.7.14; 1.8.1 to before 1.8.15; 1.9.0 to before 1.9.2 | Vulnerable | @fedify |
- cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:* Versions before 1.6.13; 1.7.0 to before 1.7.14; 1.8.1 to before 1.8.15; 1.9.0 to before 1.9.2 Vulnerable ·@fedify
Remediation
- Fix · CNA fedify (fedify-dev) Fixed in 1.6.13, 1.7.14, 1.8.15, 1.9.2
- Fix · GHSA-rchf-xwx2-hm93 @fedify/fedify (npm) Fixed in 1.6.13 Advisory →
- Fix · GHSA-rchf-xwx2-hm93 @fedify/fedify (npm) Fixed in 1.7.14 Advisory →
- Fix · GHSA-rchf-xwx2-hm93 @fedify/fedify (npm) Fixed in 1.8.15 Advisory →
- Fix · GHSA-rchf-xwx2-hm93 @fedify/fedify (npm) Fixed in 1.9.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-68475
- 2026-10-03 Alias added: GHSA-rchf-xwx2-hm93
References
Patch 2
More fedify-dev vulnerabilities
- TI-2026-44926 Fedify: Server-Side Request Forgery in getNodeInfo() Allows Access to Internal Network Resources CVSS 4.0HIGH 8.8
- TI-2025-34622 @fedify/fedify: Improper Authentication and Incorrect Authorization CVSS 4.0HIGH 8.7
- TI-2026-36902 Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges CVSS 3.1HIGH 8.6
- TI-2025-33806 Hollo renders posts received with form elements and allows submission CVSS 3.1MEDIUM 6.1
- TI-2026-30750 Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring CVSS 3.1HIGH 7.0
Sources
- CVE-2025-68475 · CVE Program
- CVE-2025-68475 · NVD
- FIRST EPSS
- GHSA-rchf-xwx2-hm93 · GitHub Advisory Database · CC BY 4.0
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