MEDIUM 6.9 NVD
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
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.
References
- https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79
- https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-s
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-08-01 via NVD.
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