medium5.3
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 siz…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | guzzlehttp/guzzle | < 7.15.1 | 7.15.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f283-ghqc-fg79
- https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79
- https://github.com/guzzle/guzzle/pull/3901
- https://github.com/guzzle/guzzle/commit/7b68220d6543f6f80fe62e633361fc9d4ead14d4
- https://github.com/guzzle/guzzle/releases/tag/7.15.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-67353
- https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service