GHSA-92F5-VC22-8J33
Vulnerability from github – Published: 2026-09-08 20:27 – Updated: 2026-09-08 20:27
VLAI
Summary
Microsoft QUIC: Remote Code Execution Vulnerability
Details
Summary
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Details
New network path creations and removals triggered by incoming packets can lead to a pointer invalidation.
Patches
- Guard path promotion e0f55b5
Impact
An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.
Severity
9.8 (Critical)
10.0 (Critical)
{
"affected": [
{
"package": {
"ecosystem": "NuGet",
"name": "Microsoft.Native.Quic.MsQuic.OpenSSL"
},
"ranges": [
{
"events": [
{
"introduced": "2.5.3"
},
{
"fixed": "2.5.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "NuGet",
"name": "Microsoft.Native.Quic.MsQuic.Schannel"
},
"ranges": [
{
"events": [
{
"introduced": "2.5.3"
},
{
"fixed": "2.5.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "NuGet",
"name": "Microsoft.Native.Quic.MsQuic.OpenSSL"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.19"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "NuGet",
"name": "Microsoft.Native.Quic.MsQuic.Schannel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.19"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-62815"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": true,
"github_reviewed_at": "2026-09-08T20:27:02Z",
"nvd_published_at": null,
"severity": "CRITICAL"
},
"details": "# Summary\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.\n\n# Details\n\nNew network path creations and removals triggered by incoming packets can lead to a pointer invalidation.\n\n## Patches\n\n- Guard path promotion [e0f55b5](https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b)\n\n# Impact\n\nAn unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.",
"id": "GHSA-92f5-vc22-8j33",
"modified": "2026-09-08T20:27:02Z",
"published": "2026-09-08T20:27:02Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62815"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/pull/6217"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/pull/6219"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/pull/6220"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b"
},
{
"type": "PACKAGE",
"url": "https://github.com/microsoft/msquic"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/releases/tag/v2.4.19"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/msquic/releases/tag/v2.5.10"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
"type": "CVSS_V4"
}
],
"summary": "Microsoft QUIC: Remote Code Execution Vulnerability"
}
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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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