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CVE-2026-50131 (GCVE-0-2026-50131)

Vulnerability from nvd – Published: 2026-06-10 20:27 – Updated: 2026-06-11 14:16

Title

Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges

Summary

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch.

Severity

8.6 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)
CWE-1286 - Improper Validation of Syntactic Correctness of Input
CWE-1389 - Incorrect Parsing of Numbers with Different Radices

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
fedify-dev	fedify	Affected: >= 0.11.2, < 1.9.12 Affected: >= 1.10.0, < 1.10.11 Affected: >= 2.0.0, < 2.0.19 Affected: >= 2.1.0, < 2.1.15 Affected: >= 2.2.0, < 2.2.4
fedify-dev	vocab-runtime	Affected: < 2.0.19 Affected: >= 2.1.0, < 2.1.15 Affected: >= 2.2.0, < 2.2.4

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-50131",
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CVE-2026-42462 (GCVE-0-2026-42462)

Vulnerability from nvd – Published: 2026-06-10 20:22 – Updated: 2026-06-11 13:34

Title

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

Summary

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.

Severity

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
CWE-347 - Improper Verification of Cryptographic Signature
CWE-436 - Interpretation Conflict
CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/releases/tag/2.2.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: >= 2.2.0, < 2.2.3 Affected: >= 2.1.0, < 2.1.14 Affected: >= 2.0.0, < 2.0.18 Affected: >= 1.10.0, < 1.10.10 Affected: < 1.9.11

Show details on NVD website

JSON

To clipboard

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CVE-2025-68475 (GCVE-0-2025-68475)

Vulnerability from nvd – Published: 2025-12-22 21:31 – Updated: 2025-12-22 21:54

Title

Fedify has ReDoS Vulnerability in HTML Parsing Regex

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.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/commit/2bdcb…	x_refsource_MISC
https://github.com/fedify-dev/fedify/commit/bf2f0…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag/1.9.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: < 1.6.13 Affected: >= 1.7.0, < 1.7.14 Affected: >= 1.8.0, < 1.8.15 Affected: >= 1.9.0, < 1.9.2

Show details on NVD website

JSON

To clipboard

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CVE-2025-54888 (GCVE-0-2025-54888)

Vulnerability from nvd – Published: 2025-08-09 01:31 – Updated: 2026-02-04 22:13

Title

@fedify/fedify: Improper Authentication and Incorrect Authorization

Summary

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. In versions below 1.3.20, 1.4.0-dev.585 through 1.4.12, 1.5.0-dev.636 through 1.5.4, 1.6.0-dev.754 through 1.6.7, 1.7.0-pr.251.885 through 1.7.8 and 1.8.0-dev.909 through 1.8.4, an authentication bypass vulnerability allows any unauthenticated attacker to impersonate any ActivityPub actor by sending forged activities signed with their own keys. Activities are processed before verifying the signing key belongs to the claimed actor, enabling complete actor impersonation across all Fedify instances. This is fixed in versions 1.3.20, 1.4.13, 1.5.5, 1.6.8, 1.7.9 and 1.8.5.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-287 - Improper Authentication
CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/commit/14a2f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: < 1.3.20 Affected: >= 1.4.0-dev.585, < 1.4.13 Affected: >= 1.5.0-dev.636, < 1.5.5 Affected: >= 1.6.0-dev.754, < 1.6.8 Affected: >= 1.7.0-pr.251.885, < 1.7.9 Affected: >= 1.8.0-dev.909, < 1.8.5

Show details on NVD website

JSON

To clipboard

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  "containers": {
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CVE-2026-50131 (GCVE-0-2026-50131)

Vulnerability from cvelistv5 – Published: 2026-06-10 20:27 – Updated: 2026-06-11 14:16

Title

Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges

Summary

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch.

Severity

8.6 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)
CWE-1286 - Improper Validation of Syntactic Correctness of Input
CWE-1389 - Incorrect Parsing of Numbers with Different Radices

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
fedify-dev	fedify	Affected: >= 0.11.2, < 1.9.12 Affected: >= 1.10.0, < 1.10.11 Affected: >= 2.0.0, < 2.0.19 Affected: >= 2.1.0, < 2.1.15 Affected: >= 2.2.0, < 2.2.4
fedify-dev	vocab-runtime	Affected: < 2.0.19 Affected: >= 2.1.0, < 2.1.15 Affected: >= 2.2.0, < 2.2.4

Show details on NVD website

JSON

To clipboard

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CVE-2026-42462 (GCVE-0-2026-42462)

Vulnerability from cvelistv5 – Published: 2026-06-10 20:22 – Updated: 2026-06-11 13:34

Title

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

Summary

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.

Severity

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
CWE-347 - Improper Verification of Cryptographic Signature
CWE-436 - Interpretation Conflict
CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/releases/tag/2.2.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: >= 2.2.0, < 2.2.3 Affected: >= 2.1.0, < 2.1.14 Affected: >= 2.0.0, < 2.0.18 Affected: >= 1.10.0, < 1.10.10 Affected: < 1.9.11

Show details on NVD website

JSON

To clipboard

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CVE-2025-68475 (GCVE-0-2025-68475)

Vulnerability from cvelistv5 – Published: 2025-12-22 21:31 – Updated: 2025-12-22 21:54

Title

Fedify has ReDoS Vulnerability in HTML Parsing Regex

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.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/commit/2bdcb…	x_refsource_MISC
https://github.com/fedify-dev/fedify/commit/bf2f0…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag/1.9.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: < 1.6.13 Affected: >= 1.7.0, < 1.7.14 Affected: >= 1.8.0, < 1.8.15 Affected: >= 1.9.0, < 1.9.2

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2025-68475",
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                    "Technical Impact": "partial"
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      "affected": [
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          "versions": [
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          "value": "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\u0027s 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."
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          "name": "https://github.com/fedify-dev/fedify/releases/tag/1.6.13",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/fedify-dev/fedify/releases/tag/1.6.13"
        },
        {
          "name": "https://github.com/fedify-dev/fedify/releases/tag/1.7.14",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/fedify-dev/fedify/releases/tag/1.7.14"
        },
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          "name": "https://github.com/fedify-dev/fedify/releases/tag/1.8.15",
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          "url": "https://github.com/fedify-dev/fedify/releases/tag/1.9.2"
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      "source": {
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      "title": "Fedify has ReDoS Vulnerability in HTML Parsing Regex"
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CVE-2025-54888 (GCVE-0-2025-54888)

Vulnerability from cvelistv5 – Published: 2025-08-09 01:31 – Updated: 2026-02-04 22:13

Title

@fedify/fedify: Improper Authentication and Incorrect Authorization

Summary

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. In versions below 1.3.20, 1.4.0-dev.585 through 1.4.12, 1.5.0-dev.636 through 1.5.4, 1.6.0-dev.754 through 1.6.7, 1.7.0-pr.251.885 through 1.7.8 and 1.8.0-dev.909 through 1.8.4, an authentication bypass vulnerability allows any unauthenticated attacker to impersonate any ActivityPub actor by sending forged activities signed with their own keys. Activities are processed before verifying the signing key belongs to the claimed actor, enabling complete actor impersonation across all Fedify instances. This is fixed in versions 1.3.20, 1.4.13, 1.5.5, 1.6.8, 1.7.9 and 1.8.5.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-287 - Improper Authentication
CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/commit/14a2f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fedify-dev	fedify	Affected: < 1.3.20 Affected: >= 1.4.0-dev.585, < 1.4.13 Affected: >= 1.5.0-dev.636, < 1.5.5 Affected: >= 1.6.0-dev.754, < 1.6.8 Affected: >= 1.7.0-pr.251.885, < 1.7.9 Affected: >= 1.8.0-dev.909, < 1.8.5

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
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                "id": "CVE-2025-54888",
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          "shortName": "CISA-ADP"
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    "cna": {
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          "product": "fedify",
          "vendor": "fedify-dev",
          "versions": [
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              "status": "affected",
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            {
              "status": "affected",
              "version": "\u003e= 1.4.0-dev.585, \u003c 1.4.13"
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              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "\u003e= 1.6.0-dev.754, \u003c 1.6.8"
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            {
              "status": "affected",
              "version": "\u003e= 1.7.0-pr.251.885, \u003c 1.7.9"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.8.0-dev.909, \u003c 1.8.5"
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      "descriptions": [
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          "lang": "en",
          "value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. In versions below 1.3.20, 1.4.0-dev.585 through 1.4.12, 1.5.0-dev.636 through 1.5.4, 1.6.0-dev.754 through 1.6.7, 1.7.0-pr.251.885 through 1.7.8 and 1.8.0-dev.909 through 1.8.4, an authentication bypass vulnerability allows any unauthenticated attacker to impersonate any ActivityPub actor by sending forged activities signed with their own keys. Activities are processed before verifying the signing key belongs to the claimed actor, enabling complete actor impersonation across all Fedify instances. This is fixed in versions 1.3.20, 1.4.13, 1.5.5, 1.6.8, 1.7.9 and 1.8.5."
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Find a vulnerability

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8 vulnerabilities found for fedify by fedify-dev

CVE-2026-50131 (GCVE-0-2026-50131)

CVE-2026-42462 (GCVE-0-2026-42462)

CVE-2025-68475 (GCVE-0-2025-68475)

CVE-2025-54888 (GCVE-0-2025-54888)

CVE-2026-50131 (GCVE-0-2026-50131)

CVE-2026-42462 (GCVE-0-2026-42462)

CVE-2025-68475 (GCVE-0-2025-68475)

CVE-2025-54888 (GCVE-0-2025-54888)