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CVE-2026-12523— Resource exhaustion in quiche HTTP/3 and QPACK layers

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之前版本存在安全漏洞，该漏洞源于HTTP/3层解析某些帧类型时基于声明长度预分配内存以及未正确应用QPACK解压缩限制，可能导致攻击者通过特制HTTP/3帧发送HEADERS帧造成资源耗尽（内存）。

CVSS 7.5 · High EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cloudflare quiche 0.1.0< 0.29.3 affected
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I. Basic Information for CVE-2026-12523

Vulnerability Information
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Vulnerability Title
Resource exhaustion in quiche HTTP/3 and QPACK layers
Source: CVE Program / CVE List V5
Vulnerability Description
Summary Cloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames. Impact HTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue. In addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()). Mitigation: * Users are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue. Credits: Disclosed responsibly by Sébastien Féry
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
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Cloudflare quiche 安全漏洞
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之前版本存在安全漏洞，该漏洞源于HTTP/3层解析某些帧类型时基于声明长度预分配内存以及未正确应用QPACK解压缩限制，可能导致攻击者通过特制HTTP/3帧发送HEADERS帧造成资源耗尽（内存）。
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 0.1.0 ~ 0.29.3 -

II. Public POCs for CVE-2026-12523

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8497 chars
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III. Intelligence Information for CVE-2026-12523

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Vendor Advisories for CVE-2026-12523 (1)

IV. Related Vulnerabilities

Same product: quiche
Same vendor: Cloudflare

V. Comments for CVE-2026-12523

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