github.com
https://github.com/guzzle/guzzle CVE-2026-67353
MEDIUM
guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service
Record summary
CVE-2026-67353 has a selected CVSS score of 6.9 (medium).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableYes
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 3, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
guzzleBrowse guzzle / guzzleDefault status: unaffected | CVE List | Before 7.15.1 | affected |
| 7.15.1 | unaffected | ||
guzzlehttp/guzzleBrowse Packagist / guzzlehttp/guzzle | GitHub Advisory | Before 7.15.1 · Fixed in 7.15.1 | affected |
References
7github.com
https://github.com/guzzle/guzzle/commit/7b68220d6543f6f80fe62e633361fc9d4ead14d4 github.com
https://github.com/guzzle/guzzle/pull/3901 github.com
https://github.com/guzzle/guzzle/releases/tag/7.15.1 GitHub Security Advisory (GHSA-f283-ghqc-fg79)Vendor advisory
https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79 nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-67353 VulnCheck Advisory: guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of ServiceThird-party advisory
https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service