FKIE_CVE-2026-27730
Vulnerability from fkie_nvd - Published: 2026-02-25 16:23 - Updated: 2026-06-17 10:27| URL | Tags | ||
|---|---|---|---|
| security-advisories@github.com | https://github.com/esm-dev/esm.sh/security/advisories/GHSA-p2v6-84h2-5x4r | Exploit, Vendor Advisory |
{
"affected": [
{
"affectedData": [
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"product": "esm.sh",
"vendor": "esm-dev",
"versions": [
{
"status": "affected",
"version": "\u003c= 137"
}
]
}
],
"source": "security-advisories@github.com"
}
],
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"vulnerable": true
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"descriptions": [
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"lang": "en",
"value": "esm.sh is a no-build content delivery network (CDN) for web development. Versions up to and including 137 have an SSRF vulnerability (CWE-918) in esm.sh\u2019s `/http(s)` fetch route. The service tries to block localhost/internal targets, but the validation is based on hostname string checks and can be bypassed using DNS alias domains. This allows an external requester to make the esm.sh server fetch internal localhost services. As of time of publication, no known patched versions exist."
},
{
"lang": "es",
"value": "esm.sh es una red de entrega de contenido (CDN) sin compilaci\u00f3n para desarrollo web. Las versiones hasta la 137 inclusive tienen una vulnerabilidad SSRF (CWE-918) en la ruta de obtenci\u00f3n \u0027/http(s)\u0027 de esm.sh. El servicio intenta bloquear objetivos localhost/internos, pero la validaci\u00f3n se basa en comprobaciones de cadenas de nombres de host y puede ser eludida usando dominios alias de DNS. Esto permite que un solicitante externo haga que el servidor de esm.sh obtenga servicios internos de localhost. Hasta el momento de la publicaci\u00f3n, no existen versiones parcheadas conocidas."
}
],
"id": "CVE-2026-27730",
"lastModified": "2026-06-17T10:27:34.187",
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
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"role": "CISA Coordinator",
"timestamp": "2026-02-25T20:31:47.872081Z",
"version": "2.0.3"
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"published": "2026-02-25T16:23:27.123",
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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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.