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CVE-2026-67353— guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service

Quick assessment

Affected
guzzle guzzle
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.

guzzle guzzle是guzzle组织的一款用于简化HTTP请求的PHP开发工具。 Guzzle 7.15.1之前版本存在资源管理错误漏洞，该漏洞源于CookieJar接受无限制的Set-Cookie头字段且无大小限制，可能导致攻击者返回大量大型Cookie，使Guzzle在内存中存储过多数据并生成过大的Cookie头，从而导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.42% · P36

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
guzzle guzzle < 7.15.1 affected
7.15.1 unaffected
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I. Basic Information for CVE-2026-67353

Vulnerability Information
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Vulnerability Title
guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
guzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions. Attackers can return many large cookies from a malicious server, causing Guzzle to store excessive data in memory and generate oversized Cookie headers that fail in handlers or destination servers.
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:L
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
Guzzle 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
guzzle guzzle是guzzle组织的一款用于简化HTTP请求的PHP开发工具。 Guzzle 7.15.1之前版本存在资源管理错误漏洞，该漏洞源于CookieJar接受无限制的Set-Cookie头字段且无大小限制，可能导致攻击者返回大量大型Cookie，使Guzzle在内存中存储过多数据并生成过大的Cookie头，从而导致拒绝服务。
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 0 ~ 7.15.1 -

II. Public POCs for CVE-2026-67353

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III. Intelligence Information for CVE-2026-67353

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Vendor Advisories for CVE-2026-67353 (2)

Same Patch Batch · guzzle · 2026-08-01 · 4 CVEs total

CVE-2026-67354 5.9 MEDIUM guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer
CVE-2026-67355 5.9 MEDIUM guzzlehttp/guzzle before 7.15.1 Host-only Cookie Scope
CVE-2026-67339 5.3 MEDIUM guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure

IV. Related Vulnerabilities

Same product: guzzle
Same vendor: guzzle
Same weakness: CWE-770