Vulnerability-Lookup

CVE-2026-67354 (GCVE-0-2026-67354)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:24

Title

guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer

Summary

guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.

Severity

8.2 (High)


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

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 18:24 UTC

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

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-2026-67354

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

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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}

GHSA-H95V-H523-3MW8

Vulnerability from github – Published: 2026-07-20 23:28 – Updated: 2026-08-04 12:53

Summary

Guzzle: URI fragments disclosed in redirect Referer headers

Details

Impact

When the optional referer redirect setting is enabled, affected versions of RedirectMiddleware can copy the fragment from the referring request URI into a generated Referer header. A URI fragment is the part after #. It is handled locally by the client and is not part of the HTTP request target, so the server handling the original request does not receive it. A generated Referer tells the redirect destination which URI led to the request. Guzzle correctly removes user information from that value, but retains the fragment when it follows a redirect to the same scheme, such as HTTPS to HTTPS. For example, an initial URI ending in #secret is sent without the fragment, but the redirect destination can receive a Referer ending in #secret. This behavior affects both the cURL and stream handlers.

An attacker who controls the redirect destination can read the fragment from the incoming header, including through request logs or application code. If the fragment contains a one-time login secret, access token, state value, or other private client data, it is disclosed to a server that was never meant to receive it. Exploitation requires the application to enable allow_redirects.referer, make a request to a URI with a sensitive fragment, and follow a same-scheme redirect to a less-trusted destination.

The referer setting is disabled by default. Applications that leave it disabled, do not put sensitive data in URI fragments, do not follow redirects, or only redirect within the same trust boundary are not affected. Guzzle already omits the generated header when the scheme changes. This issue is limited to the fragment's inclusion. Reducing the path and query on cross-origin redirects is a separate privacy policy question.

Patches

The issue is patched in 7.15.1 and later. Starting in that release, Guzzle removes both user information and the fragment before generating a redirect Referer value. Other redirect behavior does not change. Guzzle retains the referring path and query, and continues to omit the header when the scheme changes. Versions before 7.15.1 are affected when the optional referer setting is enabled.

Workarounds

If you cannot upgrade immediately, leave automatic Referer generation disabled. It is off by default. If redirect options are configured explicitly, ensure that referer is false:

$client->request('GET', $uri, [
    'allow_redirects' => ['referer' => false],
]);

Alternatively, disable automatic redirects and follow trusted destinations manually, or remove the fragment from the request URI before sending a request that may redirect. Do not rely on the fact that fragments are absent from the initial HTTP request target, because the affected middleware can reintroduce them in the generated header.

References

https://www.rfc-editor.org/rfc/rfc9110.html#section-10.1.3
https://www.rfc-editor.org/rfc/rfc3986.html#section-3.5
https://www.rfc-editor.org/rfc/rfc9700.html#section-4.2.3

Severity

5.9 (Medium)


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

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-2026-67354"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201",
      "CWE-212"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T23:28:36Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nWhen the optional `referer` redirect setting is enabled, affected versions of `RedirectMiddleware` can copy the fragment from the referring request URI into a generated `Referer` header. A URI fragment is the part after `#`. It is handled locally by the client and is not part of the HTTP request target, so the server handling the original request does not receive it. A generated `Referer` tells the redirect destination which URI led to the request. Guzzle correctly removes user information from that value, but retains the fragment when it follows a redirect to the same scheme, such as HTTPS to HTTPS. For example, an initial URI ending in `#secret` is sent without the fragment, but the redirect destination can receive a `Referer` ending in `#secret`. This behavior affects both the cURL and stream handlers.\n\nAn attacker who controls the redirect destination can read the fragment from the incoming header, including through request logs or application code. If the fragment contains a one-time login secret, access token, state value, or other private client data, it is disclosed to a server that was never meant to receive it. Exploitation requires the application to enable `allow_redirects.referer`, make a request to a URI with a sensitive fragment, and follow a same-scheme redirect to a less-trusted destination.\n\nThe `referer` setting is disabled by default. Applications that leave it disabled, do not put sensitive data in URI fragments, do not follow redirects, or only redirect within the same trust boundary are not affected. Guzzle already omits the generated header when the scheme changes. This issue is limited to the fragment\u0027s inclusion. Reducing the path and query on cross-origin redirects is a separate privacy policy question.\n\n### Patches\n\nThe issue is patched in `7.15.1` and later. Starting in that release, Guzzle removes both user information and the fragment before generating a redirect `Referer` value. Other redirect behavior does not change. Guzzle retains the referring path and query, and continues to omit the header when the scheme changes. Versions before `7.15.1` are affected when the optional `referer` setting is enabled.\n\n### Workarounds\n\nIf you cannot upgrade immediately, leave automatic Referer generation disabled. It is off by default. If redirect options are configured explicitly, ensure that `referer` is `false`:\n\n```php\n$client-\u003erequest(\u0027GET\u0027, $uri, [\n    \u0027allow_redirects\u0027 =\u003e [\u0027referer\u0027 =\u003e false],\n]);\n```\n\nAlternatively, disable automatic redirects and follow trusted destinations manually, or remove the fragment from the request URI before sending a request that may redirect. Do not rely on the fact that fragments are absent from the initial HTTP request target, because the affected middleware can reintroduce them in the generated header.\n\n### References\n\n* https://www.rfc-editor.org/rfc/rfc9110.html#section-10.1.3\n* https://www.rfc-editor.org/rfc/rfc3986.html#section-3.5\n* https://www.rfc-editor.org/rfc/rfc9700.html#section-4.2.3",
  "id": "GHSA-h95v-h523-3mw8",
  "modified": "2026-08-04T12:53:53Z",
  "published": "2026-07-20T23:28:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67354"
    },
    {
      "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-uri-fragment-disclosure-via-referer"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Guzzle: URI fragments disclosed in redirect Referer headers"
}

GHSA-MQQ9-GXG5-M58G

Vulnerability from github – Published: 2026-08-01 15:30 – Updated: 2026-08-04 12:53

Withdrawn 2026-08-04

Summary

Duplicate Advisory: Guzzle: URI fragments disclosed in redirect Referer headers

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-h95v-h523-3mw8. This link is maintained to preserve external references.

Original Description

Severity

5.9 (Medium)


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

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T12:53:33Z",
    "nvd_published_at": "2026-08-01T13:17:06Z",
    "severity": "HIGH"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-h95v-h523-3mw8. This link is maintained to preserve external references.\n\n## Original Description\n\nguzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after \u0027#\u0027) from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.",
  "id": "GHSA-mqq9-gxg5-m58g",
  "modified": "2026-08-04T12:53:33Z",
  "published": "2026-08-01T15:30:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67354"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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: URI fragments disclosed in redirect Referer headers",
  "withdrawn": "2026-08-04T12:53:33Z"
}

ubuntu-cve-2026-67354

Vulnerability from osv_ubuntu

Published

2026-08-01 13:17

Modified

2026-08-06 00:23

Summary

Details

Severity

5.9 (Medium)


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

8.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-67354	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-67354	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 an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after \u0027#\u0027) from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.",
  "id": "UBUNTU-CVE-2026-67354",
  "modified": "2026-08-06T00:23:23Z",
  "published": "2026-08-01T13:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-67354"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-67354"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-67354"
  ]
}

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-2026-67354 (GCVE-0-2026-67354)

FKIE_CVE-2026-67354

GHSA-H95V-H523-3MW8

Impact

Patches

Workarounds

References

GHSA-MQQ9-GXG5-M58G

Duplicate Advisory

Original Description

ubuntu-cve-2026-67354

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour