CVE-2026-12707Network attack vector

Service interruption via unbounded migration event queue

Published Jul 14, 2026 · Updated Jul 14, 2026

Resource exhaustion in Cloudflare quiche 0.15.0 through 0.29.2 allows remote attackers to interrupt QUIC servers after a handshake. The post-handshake PathEvents collection queues every PathEvent::ReusedSourceConnectionId generated by rapid source-address migration without a size limit. Any peer that completes the QUIC handshake can drive memory growth and service interruption, even when active connection migration is disabled.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Cloudflare quiche 0.15.0 through 0.29.2 allows remote attackers to interrupt QUIC servers after a handshake. The post-handshake PathEvents collection queues every PathEvent::ReusedSourceConnectionId generated by rapid source-address migration without a size limit. Any peer that completes the QUIC handshake can drive memory growth and service interruption, even when active connection migration is disabled.

The record

CVE
CVE-2026-12707
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Cloudflare
Product
quiche
Classifications
CWE-770, CAPEC-130, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.15.0 <0.29.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloudflare · quicheversion=0.15.0 <0.29.3

Published CVSS scores

7.5Cloudflare, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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