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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 2.5.10Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.5.10Fixed by Microsoft.Native.Quic.MsQuic.OpenSSL 2.4.19Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.4.19KEV status unknown

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.

Read the publisher's advisory

nvd · CVE-2026-62815

Published

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

Read the publisher's advisory

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Withdrawn

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-92f5-vc22-8j33.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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Sources read 12 Nov 15:26 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current