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Fencer Vulns
high 7.5

CVE-2025-68475 json

Fedify has ReDoS Vulnerability in HTML Parsing Regex

published 2025-12-22 10 mo ago modified 2026-09-28 42 d ago also GHSA-rchf-xwx2-hm93 , EUVD-2025-204741

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

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.

Patch / fix

  • npm @fedify/fedify 1.6.13, 1.7.14, 1.8.15, 1.9.2
  • fedify fedify 1.6.13, 1.7.14, 1.8.15, 1.9.2

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm @fedify/fedify
<1.6.13
>=1.7.0, <1.7.14
>=1.8.0, <1.8.15
>=1.9.0, <1.9.2
1.6.13
1.7.14
1.8.15
1.9.2

Affected products

  • fedify-dev fedify

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.