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    CVE-2026-67353

    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.

    Published:Aug 1, 2026
    Last Modified:Aug 3, 2026
    EPS:Aug 1, 2026
    EPSS Score:0.00247
    CVSS Score:5.3

    Affected Products

    Vendor
    Guzzlephp
    Product
    Guzzle

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-69246 (CVSS 7.2) — Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI a…
    CVE-2026-69245 (CVSS 6.5) — Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, SetCookie::matchesDomain() gives every sub…
    CVE-2026-67354 (CVSS 8.2) — guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware…
    CVE-2026-67355 (CVSS 8.2) — guzzlehttp/guzzle versions before 7.15.1 fail to preserve host-only cookie scope, storing the request host in …
    CVE-2026-67339 (CVSS 6.9) — guzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin serv…
    CVE-2026-59883 (CVSS 4.7) — Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies scoped to IP-addr…
    CVE-2026-55767 (CVSS 5.8) — Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, CookieJar incorrectly accepts cookies with a dot-onl…
    CVE-2026-55568 (CVSS 5.9) — Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, in certain configurations, traffic expected to be pr…
    CVE-2022-31090 (CVSS 7.7) — Guzzle, an extensible PHP HTTP client. `Authorization` headers on requests are sensitive information. In affec…
    CVE-2022-31091 (CVSS 7.7) — Guzzle, an extensible PHP HTTP client. `Authorization` and `Cookie` headers on requests are sensitive informat…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High