Vulnerability-Lookup

CVE-2026-67353 (GCVE-0-2026-67353)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:19

Title

guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service

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.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 18:17 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/guzzle/guzzle/security/advisor…	vendor-advisory
https://www.vulncheck.com/advisories/guzzlehttp-g…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
guzzle	guzzle	Affected: 0 , < 7.15.1 (semver) Unaffected: 7.15.1 (semver) cpe:2.3:a:guzzlephp:guzzle::::::::

Date Public

2026-07-18 00:00

Credits

GrahamCampbell

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-67353

Vulnerability from fkie_nvd - Published: 2026-08-01 13:17 - Updated: 2026-09-08 20:35

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-67353",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-03T18:17:41.542665Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-01T13:17:06.000",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-3FVR-2JW6-CRQ4

Vulnerability from github – Published: 2026-08-01 15:30 – Updated: 2026-08-04 12:58

Withdrawn 2026-08-04

Summary

Duplicate Advisory: Guzzle: Unbounded response cookies risk denial of service

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-f283-ghqc-fg79. This link is maintained to preserve external references.

Original Description

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 7.15.1"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "guzzlehttp/guzzle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T12:58:31Z",
    "nvd_published_at": "2026-08-01T13:17:06Z",
    "severity": "MODERATE"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-f283-ghqc-fg79. This link is maintained to preserve external references.\n\n## Original Description\nguzzlehttp/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.",
  "id": "GHSA-3fvr-2jw6-crq4",
  "modified": "2026-08-04T12:58:32Z",
  "published": "2026-08-01T15:30:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67353"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Duplicate Advisory: Guzzle: Unbounded response cookies risk denial of service",
  "withdrawn": "2026-08-04T12:58:31Z"
}

GHSA-F283-GHQC-FG79

Vulnerability from github – Published: 2026-07-20 23:27 – Updated: 2026-08-04 12:58

Summary

Guzzle: Unbounded response cookies risk denial of service

Details

Impact

In affected versions, Guzzle's built-in CookieJar accepts any number of Set-Cookie header fields from one response, with no limit on the size of each field. When a later request matches the stored cookies, Guzzle places every match into one generated Cookie header without limiting the number of cookies or the total header length.

A malicious or compromised server can therefore return many large cookies, causing Guzzle to store attacker-controlled data in memory and copy it into later request headers. This can increase memory use and processing time. It can also make later requests fail when the generated header exceeds a limit in a handler, HTTP implementation, proxy, or destination server. A server on one sibling host, such as attacker.example.com, can also set parent-domain cookies that are later selected for another sibling, such as service.example.com. The denial can therefore affect a different service that uses the same jar.

An application is affected when it enables the built-in cookie support, receives an attacker-controlled response, and retains or reuses the jar. The issue affects both built-in handlers because Guzzle manages these cookies itself instead of using libcurl's native cookie engine. cURL addressed a similar denial-of-service issue in CVE-2022-32205 by limiting the cookies it accepts and sends, but those native limits do not protect Guzzle's separate jar. Applications that do not use cookies, use separate jars for untrusted origins, or use a third-party CookieJarInterface with suitable limits are not affected by this behavior. The demonstrated direct impact is limited to availability. The patch does not impose a lifetime limit on a jar built up over an unlimited number of responses or populated directly by application code.

Patches

The issue is patched in 7.15.1 and later. Starting in that release, the built-in CookieJar ignores a Set-Cookie field value longer than 8,190 bytes and applies at most 50 successful cookie insertions or replacements from one response. When generating a request, it emits at most 150 matching name=value pairs and limits the complete Cookie: header line to 8,190 bytes, including the field name and following space.

These limits follow the same practical shape as cURL's response to CVE-2022-32205. Both bound cookies accepted from one response, cookies added to one request, and generated header size. Guzzle's 8,190-byte incoming field limit is more generous than cURL's current 5,000-byte cookie-line limit. Neither approach adds a global jar quota or an eviction policy. The 8,190-byte incoming boundary is inclusive. Invalid, unrelated, identical, oversized, and deletion fields do not consume the 50-cookie limit. For outgoing requests, Guzzle preserves its existing matching and iteration order. It stops after 150 pairs or before the first matching cookie that would exceed the line limit. The output limits also apply to directly imported cookie state, but that state is not limited when it is added to the jar. Explicit caller-supplied Cookie headers and third-party jar implementations remain the caller's responsibility. Versions before 7.15.1 are affected.

Workarounds

If you cannot upgrade immediately, do not enable a shared built-in cookie jar for requests to untrusted origins. Use separate jars per host or trust boundary, disable cookie handling for untrusted requests, and discard or clear a jar after receiving an untrusted response before it is reused. Applications that must accept cookies from untrusted peers can provide a custom CookieJarInterface implementation that enforces suitable limits.

Guzzle does not use libcurl's cookie engine for cookies stored in a CookieJar. The cURL handler sends the Cookie header that Guzzle's cookie middleware has already built, so libcurl's cookie limits do not apply. Upgrading libcurl therefore does not fix this issue.

References

https://curl.se/docs/CVE-2022-32205.html
https://www.rfc-editor.org/rfc/rfc10025.html#section-5.7
https://www.rfc-editor.org/rfc/rfc10025.html#section-5.8.3
https://www.rfc-editor.org/rfc/rfc10025.html#section-6.1

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "guzzlehttp/guzzle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.15.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-67353"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1325",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T23:27:02Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nIn affected versions, Guzzle\u0027s built-in `CookieJar` accepts any number of `Set-Cookie` header fields from one response, with no limit on the size of each field. When a later request matches the stored cookies, Guzzle places every match into one generated `Cookie` header without limiting the number of cookies or the total header length.\n\nA malicious or compromised server can therefore return many large cookies, causing Guzzle to store attacker-controlled data in memory and copy it into later request headers. This can increase memory use and processing time. It can also make later requests fail when the generated header exceeds a limit in a handler, HTTP implementation, proxy, or destination server. A server on one sibling host, such as `attacker.example.com`, can also set parent-domain cookies that are later selected for another sibling, such as `service.example.com`. The denial can therefore affect a different service that uses the same jar.\n\nAn application is affected when it enables the built-in cookie support, receives an attacker-controlled response, and retains or reuses the jar. The issue affects both built-in handlers because Guzzle manages these cookies itself instead of using libcurl\u0027s native cookie engine. cURL addressed a similar denial-of-service issue in CVE-2022-32205 by limiting the cookies it accepts and sends, but those native limits do not protect Guzzle\u0027s separate jar. Applications that do not use cookies, use separate jars for untrusted origins, or use a third-party `CookieJarInterface` with suitable limits are not affected by this behavior. The demonstrated direct impact is limited to availability. The patch does not impose a lifetime limit on a jar built up over an unlimited number of responses or populated directly by application code.\n\n### Patches\n\nThe issue is patched in `7.15.1` and later. Starting in that release, the built-in `CookieJar` ignores a `Set-Cookie` field value longer than 8,190 bytes and applies at most 50 successful cookie insertions or replacements from one response. When generating a request, it emits at most 150 matching `name=value` pairs and limits the complete `Cookie: ` header line to 8,190 bytes, including the field name and following space.\n\nThese limits follow the same practical shape as cURL\u0027s response to CVE-2022-32205. Both bound cookies accepted from one response, cookies added to one request, and generated header size. Guzzle\u0027s 8,190-byte incoming field limit is more generous than cURL\u0027s current 5,000-byte cookie-line limit. Neither approach adds a global jar quota or an eviction policy. The 8,190-byte incoming boundary is inclusive. Invalid, unrelated, identical, oversized, and deletion fields do not consume the 50-cookie limit. For outgoing requests, Guzzle preserves its existing matching and iteration order. It stops after 150 pairs or before the first matching cookie that would exceed the line limit. The output limits also apply to directly imported cookie state, but that state is not limited when it is added to the jar. Explicit caller-supplied `Cookie` headers and third-party jar implementations remain the caller\u0027s responsibility. Versions before `7.15.1` are affected.\n\n### Workarounds\n\nIf you cannot upgrade immediately, do not enable a shared built-in cookie jar for requests to untrusted origins. Use separate jars per host or trust boundary, disable cookie handling for untrusted requests, and discard or clear a jar after receiving an untrusted response before it is reused. Applications that must accept cookies from untrusted peers can provide a custom `CookieJarInterface` implementation that enforces suitable limits.\n\nGuzzle does not use libcurl\u0027s cookie engine for cookies stored in a `CookieJar`. The cURL handler sends the `Cookie` header that Guzzle\u0027s cookie middleware has already built, so libcurl\u0027s cookie limits do not apply. Upgrading libcurl therefore does not fix this issue.\n\n### References\n\n* https://curl.se/docs/CVE-2022-32205.html\n* https://www.rfc-editor.org/rfc/rfc10025.html#section-5.7\n* https://www.rfc-editor.org/rfc/rfc10025.html#section-5.8.3\n* https://www.rfc-editor.org/rfc/rfc10025.html#section-6.1",
  "id": "GHSA-f283-ghqc-fg79",
  "modified": "2026-08-04T12:58:41Z",
  "published": "2026-07-20T23:27:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67353"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/pull/3901"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/commit/7b68220d6543f6f80fe62e633361fc9d4ead14d4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/guzzle/guzzle"
    },
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/releases/tag/7.15.1"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Guzzle: Unbounded response cookies risk denial of service"
}

UBUNTU-CVE-2026-67353 (CVE-2026-67353)

Vulnerability from osv_ubuntu – Published: 2026-08-01 13:17 – Updated: 2026-08-06 00:23 – Source website

Details

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-67353	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-67353	REPORT
	https://github.com/guzzle/guzzle/security/advisor…	REPORT
	https://www.vulncheck.com/advisories/guzzlehttp-g…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "php-guzzlehttp-guzzle",
            "binary_version": "7.4.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "guzzle",
        "purl": "pkg:deb/ubuntu/guzzle@7.4.5-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.4.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "php-guzzlehttp-guzzle",
            "binary_version": "7.9.2-0.1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "guzzle",
        "purl": "pkg:deb/ubuntu/guzzle@7.9.2-0.1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.9.2-0.1",
        "7.9.2-0.1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-67353",
  "modified": "2026-08-06T00:23:23Z",
  "published": "2026-08-01T13:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-67353"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-67353"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-67353"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-67353 (GCVE-0-2026-67353)

FKIE_CVE-2026-67353

GHSA-3FVR-2JW6-CRQ4

Duplicate Advisory

Original Description

GHSA-F283-GHQC-FG79

Impact

Patches

Workarounds

References

UBUNTU-CVE-2026-67353 (CVE-2026-67353)

Tags

Sightings

Nomenclature

Related by attack behaviour