FKIE_CVE-2026-50131
Vulnerability from fkie_nvd - Published: 2026-06-10 22:17 - Updated: 2026-07-21 19:10
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "fedify",
"vendor": "fedify-dev",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.11.2, \u003c 1.9.12"
},
{
"status": "affected",
"version": "\u003e= 1.10.0, \u003c 1.10.11"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.0.19"
},
{
"status": "affected",
"version": "\u003e= 2.1.0, \u003c 2.1.15"
},
{
"status": "affected",
"version": "\u003e= 2.2.0, \u003c 2.2.4"
}
]
},
{
"product": "vocab-runtime",
"vendor": "fedify-dev",
"versions": [
{
"status": "affected",
"version": "\u003c 2.0.19"
},
{
"status": "affected",
"version": "\u003e= 2.1.0, \u003c 2.1.15"
},
{
"status": "affected",
"version": "\u003e= 2.2.0, \u003c 2.2.4"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Fedify es una biblioteca TypeScript para construir aplicaciones de servidor federadas impulsadas por ActivityPub. Fedify abord\u00f3 previamente el acceso SSRF/a la red interna en GHSA-p9cg-vqcc-grcx a\u00f1adiendo validaci\u00f3n de URL p\u00fablica antes de la obtenci\u00f3n de documentos y medios en tiempo de ejecuci\u00f3n. Sin embargo, la l\u00f3gica de validaci\u00f3n de IPv4 presente a partir de la versi\u00f3n 0.11.2 y anterior a las versiones 1.9.12, 1.10.11, 2.0.19, 2.1.15 y 2.2.4 parece incompleta. La protecci\u00f3n \u0027validatePublicUrl()\u0027 se basa en \u0027isValidPublicIPv4Address()\u0027 para rechazar destinos IPv4 no p\u00fablicos. La funci\u00f3n bloquea rangos privados y locales comunes como \u002710.0.0.0/8\u0027, \u0027127.0.0.0/8\u0027, \u0027169.254.0.0/16\u0027, \u0027172.16.0.0/12\u0027 y \u0027192.168.0.0/16\u0027, pero a\u00fan trata varios rangos IPv4 de uso especial, reservados, de multidifusi\u00f3n, de evaluaci\u00f3n comparativa y de NAT de grado de operador como destinos p\u00fablicos v\u00e1lidos. Debido a que esta validaci\u00f3n se utiliza como defensa SSRF antes de las recuperaciones salientes, esto parece ser una mitigaci\u00f3n incompleta o una clase de bypass para el problema SSRF anterior. Las versiones 1.9.12, 1.10.11, 2.0.19, 2.1.15 y 2.2.4 contienen un parche actualizado."
}
],
"id": "CVE-2026-50131",
"lastModified": "2026-07-21T19:10:00.107",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.7,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-50131",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-11T14:15:27.570315Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-10T22:17:01.543",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-xw9q-2mv6-9fr8"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-xw9q-2mv6-9fr8"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-918"
},
{
"lang": "en",
"value": "CWE-1286"
},
{
"lang": "en",
"value": "CWE-1389"
}
],
"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.
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