FKIE_CVE-2026-34148
Vulnerability from fkie_nvd - Published: 2026-04-06 16:16 - Updated: 2026-06-17 10:38
Severity
Summary
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| fedify | fedify\/fedify | * | |
| fedify | fedify\/fedify | * | |
| fedify | fedify\/fedify | * | |
| fedify | fedify\/fedify | * | |
| fedify | fedify\/vocab-runtime | * | |
| fedify | fedify\/vocab-runtime | * |
{
"affected": [
{
"affectedData": [
{
"product": "fedify",
"vendor": "@fedify",
"versions": [
{
"status": "affected",
"version": "\u003c 1.9.6"
},
{
"status": "affected",
"version": "\u003e= 1.10.0, \u003c 1.10.5"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.0.8"
},
{
"status": "affected",
"version": "\u003e= 2.1.0, \u003c 2.1.1"
}
]
},
{
"product": "vocab-runtime",
"vendor": "@fedify",
"versions": [
{
"status": "affected",
"version": "\u003c 2.0.8"
},
{
"status": "affected",
"version": "\u003e= 2.1.0, \u003c 2.1.1"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "ECF8706E-2E6C-4A6A-8F8C-DE9933F39224",
"versionEndExcluding": "1.9.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "BF4917D5-C6AA-45E3-B5F6-B3DCEF460212",
"versionEndExcluding": "1.10.5",
"versionStartIncluding": "1.10.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "DD7D6EB1-0E97-43AE-9412-FA558F8FFA6B",
"versionEndExcluding": "2.0.8",
"versionStartIncluding": "2.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "0613E25B-2982-4E31-A7FB-5FF0F10FA724",
"versionEndExcluding": "2.1.1",
"versionStartIncluding": "2.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:fedify:fedify\\/vocab-runtime:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "C298320F-CF10-4C9F-B8B5-F96ACDBFA963",
"versionEndExcluding": "2.0.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:fedify:fedify\\/vocab-runtime:*:*:*:*:*:node.js:*:*",
"matchCriteriaId": "B6CC76BF-8504-4630-832A-F5EA09191546",
"versionEndExcluding": "2.1.1",
"versionStartIncluding": "2.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1."
}
],
"id": "CVE-2026-34148",
"lastModified": "2026-06-17T10:38:34.750",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-34148",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-06T15:35:17.193226Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-06T16:16:34.387",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Release Notes"
],
"url": "https://github.com/fedify-dev/fedify/releases/tag/1.10.5"
},
{
"source": "security-advisories@github.com",
"tags": [
"Release Notes"
],
"url": "https://github.com/fedify-dev/fedify/releases/tag/1.9.6"
},
{
"source": "security-advisories@github.com",
"tags": [
"Release Notes"
],
"url": "https://github.com/fedify-dev/fedify/releases/tag/2.0.8"
},
{
"source": "security-advisories@github.com",
"tags": [
"Release Notes"
],
"url": "https://github.com/fedify-dev/fedify/releases/tag/2.1.1"
},
{
"source": "security-advisories@github.com",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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