Memory Resource Exhaustion Vulnerability in Cloudflare quiche
CVE-2026-12707

7.5HIGH

Key Information:

Vendor

Cloudflare

Status
Quiche
Vendor
CVE Published:
14 July 2026

What is CVE-2026-12707?

A memory resource exhaustion vulnerability has been identified in Cloudflare's quiche, specifically affecting its implementation of unbounded queuing for post-handshake client migration events. This occurs during the migration of a QUIC connection, where an attacker could exploit rapid source address migration after a handshake is completed. The queued PathEvent::ReusedSourceConnectionId will continue to grow without proper limits, allowing potential denial of service due to excessive resource consumption. Mitigation involves ensuring applications that utilize quiche call path_event_next() effectively to manage the PathEvent collection. Users should upgrade to quiche version 0.29.3 or newer to resolve these concerns.

Affected Version(s)

quiche 0.15.0 < 0.29.3

References

https://github.com/cloudflare/quiche/security/advisories/...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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