CVE-2025-68475Public exploitNetwork attack vector

Service interruption via catastrophic HTML regex backtracking

Published Dec 22, 2025 · Updated Dec 22, 2025

ReDoS in Fedify's document loader before 1.6.13, 1.7.14, 1.8.15, and 1.9.2 allows remote attackers to interrupt service. The regex in packages/fedify/src/runtime/docloader.ts uses nested quantified attribute groups on unbounded HTML, causing catastrophic backtracking. Exploitation requires a Fedify application to fetch HTML from an attacker-controlled federated server, blocking the Node.js event loop for seconds or longer.

CVSS severity7.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in Fedify's document loader before 1.6.13, 1.7.14, 1.8.15, and 1.9.2 allows remote attackers to interrupt service. The regex in packages/fedify/src/runtime/docloader.ts uses nested quantified attribute groups on unbounded HTML, causing catastrophic backtracking. Exploitation requires a Fedify application to fetch HTML from an attacker-controlled federated server, blocking the Node.js event loop for seconds or longer.

The record

CVE
CVE-2025-68475
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
Fedify
Product
Fedify
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.6.13
  2. Affected versionversion=>= 1.7.0, < 1.7.14
  3. Affected versionversion=>= 1.8.0, < 1.8.15
  4. Affected versionversion=>= 1.9.0, < 1.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedify · Fedifyversion=< 1.6.13; version=>= 1.7.0, < 1.7.14; version=>= 1.8.0, < 1.8.15; version=>= 1.9.0, < 1.9.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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