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Vulnerability Details :

CVE-2026-42462

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-10 Jun, 2026 | 20:22
Updated At-11 Jun, 2026 | 13:34
Rejected At-
Credits

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

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:10 Jun, 2026 | 20:22
Updated At:11 Jun, 2026 | 13:34
Rejected At:
▼CVE Numbering Authority (CNA)
Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring

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.

Affected Products
Vendor
fedify-dev
Product
fedify
Versions
Affected
  • >= 2.2.0, < 2.2.3
  • >= 2.1.0, < 2.1.14
  • >= 2.0.0, < 2.0.18
  • >= 1.10.0, < 1.10.10
  • < 1.9.11
Problem Types
TypeCWE IDDescription
CWECWE-180CWE-180: Incorrect Behavior Order: Validate Before Canonicalize
CWECWE-347CWE-347: Improper Verification of Cryptographic Signature
CWECWE-436CWE-436: Interpretation Conflict
CWECWE-1289CWE-1289: Improper Validation of Unsafe Equivalence in Input
Type: CWE
CWE ID: CWE-180
Description: CWE-180: Incorrect Behavior Order: Validate Before Canonicalize
Type: CWE
CWE ID: CWE-347
Description: CWE-347: Improper Verification of Cryptographic Signature
Type: CWE
CWE ID: CWE-436
Description: CWE-436: Interpretation Conflict
Type: CWE
CWE ID: CWE-1289
Description: CWE-1289: Improper Validation of Unsafe Equivalence in Input
Metrics
VersionBase scoreBase severityVector
3.17.0HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Version: 3.1
Base score: 7.0
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/releases/tag/2.2.3
x_refsource_MISC
Hyperlink: https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/fedify-dev/fedify/releases/tag/2.2.3
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:10 Jun, 2026 | 22:16
Updated At:11 Jun, 2026 | 15:34

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.0HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Type: Secondary
Version: 3.1
Base score: 7.0
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-180Primarysecurity-advisories@github.com
CWE-347Primarysecurity-advisories@github.com
CWE-436Primarysecurity-advisories@github.com
CWE-1289Primarysecurity-advisories@github.com
CWE ID: CWE-180
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-347
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-436
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-1289
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/fedify-dev/fedify/releases/tag/2.2.3security-advisories@github.com
N/A
https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367security-advisories@github.com
N/A
Hyperlink: https://github.com/fedify-dev/fedify/releases/tag/2.2.3
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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