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CVE-2026-42462

31
FAUCET Score

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.

First published: Jun 10, 2026Last modified: Jun 10, 2026

Impacted Technologies

VendorProductVersion(s)CPE
Fedify-DevFedify
< 1.9.11, >= 1.10.0, < 1.10.10, >= 2.0.0, < 2.0.18, >= 2.1.0, < 2.1.14, >= 2.2.0, < 2.2.3CNA affected

CVSS Data

CVSS version used by this source: 3.1

7.0HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.17%
Probability of exploitation in next 30 days
EPSS Percentile
6.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0017 is in the 0th percentile among its peer group of 8,915 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

npmpatch availablevia ghsa
Product: @fedify/fedifyFixed in: 2.2.3
npmpatch availablevia ghsa
Product: @fedify/fedifyFixed in: 2.1.14
npmpatch availablevia ghsa
Product: @fedify/fedifyFixed in: 2.0.18
npmpatch availablevia ghsa
Product: @fedify/fedifyFixed in: 1.10.10
npmpatch availablevia ghsa
Product: @fedify/fedifyFixed in: 1.9.11

Vendor Advisories (1)

npmGHSA-9rfg-v8g9-9367high

Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

May 26, 2026

References

github.com / fedify-dev/fedify/releases/tag/2.2.3
github.com / fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367