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CVE-2026-69246— Guzzle: Noncanonical host can bypass host-based checks

Quick assessment

Affected
guzzle guzzle
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.

guzzle是guzzle组织的一款HTTP客户端Web组件。 Guzzle 7.15.2之前版本和8.0.1之前版本存在安全漏洞，该漏洞源于处理请求URI与Host头时存在解析差异，可能导致攻击者绕过主机访问限制，访问应用程序检查排除的主机并读取其响应信息。

CVSS 7.2 · High EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
guzzle guzzle >= 8.0.0, < 8.0.1 affected
< 7.15.2 affected
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I. Basic Information for CVE-2026-69246

Vulnerability Information
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Vulnerability Title
Guzzle: Noncanonical host can bypass host-based checks
Source: CVE Program / CVE List V5
Vulnerability Description
Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：规范化之前验证
Source: CVE Program / CVE List V5
Vulnerability Title
Guzzle 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
guzzle是guzzle组织的一款HTTP客户端Web组件。 Guzzle 7.15.2之前版本和8.0.1之前版本存在安全漏洞，该漏洞源于处理请求URI与Host头时存在解析差异，可能导致攻击者绕过主机访问限制，访问应用程序检查排除的主机并读取其响应信息。
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
guzzle guzzle >= 8.0.0, < 8.0.1 -

II. Public POCs for CVE-2026-69246

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9306 chars
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III. Intelligence Information for CVE-2026-69246

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Patches & Fixes for CVE-2026-69246 (2)

Vendor Advisories for CVE-2026-69246 (1)

Vendor Pages for CVE-2026-69246 (1)

Other References for CVE-2026-69246 (1)

IV. Related Vulnerabilities

Same product: guzzle
Same vendor: guzzle
Same weakness: CWE-180

V. Comments for CVE-2026-69246

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