guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service
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.
CVE-2026-67353
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-67353
guzzle
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "guzzle",
"product": "guzzle",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "7.15.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.15.1",
"versionType": "semver"
}
],
"packageURL": "pkg:composer/guzzlehttp/guzzle",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-67353
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12814 · Revision 1
- Added to Heist Feed
- Publisher date