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TI-2026-47649 Aliases CVE-2026-67353GHSA-f283-ghqc-fg79

guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service

Priority LOW 37CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00418 36th percentileScored 2026-11-07
Fix Fixed guzzle (guzzle): 7.15.1guzzlehttp/guzzle (Packagist): 7.15.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
guzzleguzzlebefore 7.15.17.15.1Patch availableCNA
—guzzlehttp/guzzle (Packagist)before 7.15.17.15.1Patch availableGHSA-f283-ghqc-fg79
  • guzzle Vendorguzzle Affected before 7.15.1 Fixed in 7.15.1 Patch available CNA
  • guzzlehttp/guzzle (Packagist) Vendor— Affected before 7.15.1 Fixed in 7.15.1 Patch available GHSA-f283-ghqc-fg79

Remediation

  • Fix · CNA guzzle (guzzle) Fixed in 7.15.1
  • Fix · GHSA-f283-ghqc-fg79 guzzlehttp/guzzle (Packagist) Fixed in 7.15.1 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    guzzle 7.15.1

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-47651 guzzlehttp/guzzle before 7.15.1 Host-only Cookie ScopePriority LOW 36
    • TI-2026-47650 guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via RefererPriority LOW 36
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67353
  2. 2026-10-03 Alias added: GHSA-f283-ghqc-fg79

References

Advisory 2

Other 4

  • TI-2022-08589 Improper Input Validation in guzzlehttp/psr7 CVSS 3.1HIGH 7.5
  • TI-2022-13088 Fix failure to strip Authorization header on HTTP downgrade in Guzzle CVSS 3.1HIGH 7.5
  • TI-2022-13087 Failure to strip the Cookie header on change in host or HTTP downgrade in Guzzle CVSS 3.1HIGH 7.5
  • TI-2023-13898 Laminas Diactoros vulnerable to HTTP Multiline Header Termination CVSS 3.1HIGH 7.5
  • TI-2022-11789 Cross-domain cookie leakage in Guzzle CVSS 3.1HIGH 8.1
  • TI-2026-48585 Guzzle: Noncanonical host can bypass host-based checks CVSS 3.1HIGH 7.2
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences