Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-12707— Unbounded path event queue growth in quiche via peer-driven source connection ID rotation

Quick assessment

Affected
Cloudflare quiche
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cloudflare quiche是美国Cloudflare公司开源的一个 IETF 指定的 QUIC 传输协议和 HTTP/3 的实现。 Cloudflare quiche 0.29.3之前版本存在资源管理错误漏洞，该漏洞源于握手后客户端迁移事件导致的未绑定队列，可能造成内存资源耗尽。

CVSS 7.5 · High EPSS 0.44% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cloudflare quiche 0.15.0< 0.29.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-12707

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Unbounded path event queue growth in quiche via peer-driven source connection ID rotation
Source: CVE Program / CVE List V5
Vulnerability Description
Summary Cloudflare quiche was discovered to be vulnerable to memory resource exhaustion due to unbounded queuing of post-handshake client migration events. Impact quiche supports the connection migration features described in Section 9 of RFC 9000, which allows a single QUIC connection to survive changes in the network path. Although quiche implements the protections described in Section 9.3 of RFC 9000 to limit server state commitment, it was discovered that the collection of PathEvents, intended to be consumed by applications via the path_event_next() function, was not bounded. Once the QUIC handshake completed, a peer could exploit rapid source address migration in order to cause unbounded queuing of the PathEvent::ReusedSourceConnectionId type. Servers are vulnerable even if active connection migration is disabled. Mitigation: * Applications can call path_event_next() to drain the PathEvent collection, mitigating the attack. * Users are requested to upgrade to quiche 0.29.3 which is the earliest version that prevents excessive queueing of PathEvent::ReusedSourceConnectionId.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Cloudflare quiche 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloudflare quiche是美国Cloudflare公司开源的一个 IETF 指定的 QUIC 传输协议和 HTTP/3 的实现。 Cloudflare quiche 0.29.3之前版本存在资源管理错误漏洞，该漏洞源于握手后客户端迁移事件导致的未绑定队列，可能造成内存资源耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cloudflare quiche 0.15.0 ~ 0.29.3 -

II. Public POCs for CVE-2026-12707

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7115 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-12707

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-12707 (1)

IV. Related Vulnerabilities

Same product: quiche
Same vendor: Cloudflare
Same weakness: CWE-770

V. Comments for CVE-2026-12707

No comments yet

Leave a comment