CVE-2026-62815Withdrawn

Microsoft QUIC Remote Code Execution Vulnerability

CVSS 3.1 9.8 CRITICALEUVD CVSS 3.1 9.8 CVSS 3.1 · [email protected] · Secondary 9.8 CRITICALCVSS_V3 Publisher rating CRITICALCVSS_V3 CVSS_V4 Publisher rating CRITICALFixed by Microsoft.Native.Quic.MsQuic.OpenSSL 2.5.10 Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.5.10 Fixed by Microsoft.Native.Quic.MsQuic.OpenSSL 2.4.19 Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.4.19KEV status unknown

Original advisory

cve-program · CVE-2026-62815

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

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euvd · EUVD-2026-56392

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

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nvd · CVE-2026-62815

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

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osv · GHSA-2q33-cf8w-7q23

Withdrawn

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-92f5-vc22-8j33. This link is maintained to preserve external references. ## Original Description Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

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osv · GHSA-92f5-vc22-8j33

Published

# 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](https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b) # 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.

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Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

CVE-2026-62815

This is a saved version of the risk data. The advisory details have their own history. Latest risk data.

No CISA KEV listing is included in this saved record. Exploitation may still have occurred.

FIRST EPSS: 0.97 % · percentile 61.76 % · scored 24 Oct 2026. This score is more than two days old.

Saved 25 Oct 2026 02:24:38 UTC · View this risk record (JSON)

Advisory history

15 saved versions

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Each link identifies one complete publisher record. History can include advisories that previously shared an identifier; an identifier removed by a publisher no longer establishes a current relationship. A historical link shows only that record and earlier saved versions. Failed checks and unchanged reads do not create new versions.

12 Nov 2026 03:03:46 UTC

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-56392 · Published

10 Nov 2026 23:21:22 UTC