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CVE-2026-110353

Quick assessment

Affected
HAProxy HAProxy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 HAProxy 3.2 到 3.4.6 之前的版本中，远程未认证的攻击者可通过发送被截断的 HTTP/2 PING 帧，引发拒绝服务（DoS）攻击，导致工作线程 CPU 资源耗尽。问题根源在于 中的 函数未对短读取（short read）情况进行检查，而其他 HTTP/2 帧处理器均包含此类检查。由于该不完整帧无法被正常处理，其数据始终未被消费，导致 HTTP/2 多路复用器任务单元（tasklet）因该待处理数据而反复被唤醒，却无法取得进展。CPU 将持续空转，直到 超时并关闭连接。若攻击者同时建立大量此类连

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-110353

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.
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
未加检查的返回值
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HAProxy HAProxy 3.2.0 ~ 3.2.26 -
HAProxy HAProxy Enterprise Edition 3.2.0r1 ~ 3.2r1-378.1259 -
HAProxy Kubernetes Ingress Controller 3.2.0 ~ 3.2.17 -
Haproxy Kubernetes Ingress Controller Enterprise 3.2.0 ~ 3.2.17-ee1 -

II. Public POCs for CVE-2026-110353

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III. Intelligence Information for CVE-2026-110353

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Other References for CVE-2026-110353 (1)

IV. Related Vulnerabilities

Same product: HAProxy
Same vendor: HAProxy
Same weakness: CWE-252

V. Comments for CVE-2026-110353

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