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CVE-2026-26080

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.

HAProxy是法国HAProxy公司的一款开源的TCP/HTTP负载均衡服务器。该服务器提供4层、7层代理，并能支持上万级别的连接，具有高效、稳定等特点。 HAProxy存在安全漏洞，该漏洞源于QUIC数据包截断Varint问题，可能导致拒绝服务攻击。

CVSS 3.7 · Low EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
HAProxy HAProxy 3.2< 3.2.12 affected
3.3< 3.3.3 affected
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I. Basic Information for CVE-2026-26080

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
HAProxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAProxy是法国HAProxy公司的一款开源的TCP/HTTP负载均衡服务器。该服务器提供4层、7层代理，并能支持上万级别的连接，具有高效、稳定等特点。 HAProxy存在安全漏洞，该漏洞源于QUIC数据包截断Varint问题，可能导致拒绝服务攻击。
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
HAProxy HAProxy 3.2 ~ 3.2.12 -

II. Public POCs for CVE-2026-26080

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III. Intelligence Information for CVE-2026-26080

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Patches & Fixes for CVE-2026-26080 (1)

Vendor Pages for CVE-2026-26080 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-26080

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