CVE-2026-67353CWE-770denial-of-service

CVE-2026-67353

Medium · published August 1, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
35.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00418 · 35.0th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-08-01T17:17Z
References (2)
https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79 · [email protected]https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service
    cvelistv5