Microsoft QUIC: Remote Code Execution Vulnerability
# 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-62815US | — | — | ||
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network. | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/microsoft/msquicPACKAGE
- https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0WEB
- https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20WEB
- https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3bWEB
- https://github.com/microsoft/msquic/pull/6217WEB
- https://github.com/microsoft/msquic/pull/6219WEB
- https://github.com/microsoft/msquic/pull/6220WEB
- https://github.com/microsoft/msquic/releases/tag/v2.4.19WEB
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