Vulnerability-Lookup

GHSA-48RX-C7PG-Q66R

Vulnerability from github – Published: 2026-07-10 20:37 – Updated: 2026-07-21 18:11

Summary

Excon does not redact additional sensitive/risky headers when following redirects

Details

Impact

The redirect follower middleware previously failed to strip a number of headers that are known to be sensitive and did not provide a way to provide a custom list of headers to strip.

What kind of vulnerability is it? Who is impacted? This could cause inadvertent leakage of sensitive data for users of the RedirectFollower middleware in cases where the initial request includes header information that is not intended for the new target.

Patches

Patch exists and is released in v1.5.0

Workarounds

Users can backport the fix to a custom redirect follower middleware.

Severity

6.5 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "excon"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54171"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201",
      "CWE-200",
      "CWE-522"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-10T20:37:29Z",
    "nvd_published_at": "2026-07-17T20:17:26Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe redirect follower middleware previously failed to strip a number of headers that are known to be sensitive and did not provide a way to provide a custom list of headers to strip. \n\n_What kind of vulnerability is it? Who is impacted?_\nThis could cause inadvertent leakage of sensitive data for users of the RedirectFollower middleware in cases where the initial request includes header information that is not intended for the new target.\n\n### Patches\nPatch exists and is released in v1.5.0\n\n### Workarounds\nUsers can backport the [fix](https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3) to a custom redirect follower middleware.",
  "id": "GHSA-48rx-c7pg-q66r",
  "modified": "2026-07-21T18:11:28Z",
  "published": "2026-07-10T20:37:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/excon/excon/security/advisories/GHSA-48rx-c7pg-q66r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54171"
    },
    {
      "type": "WEB",
      "url": "https://github.com/excon/excon/pull/901"
    },
    {
      "type": "WEB",
      "url": "https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/excon/excon"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/excon/CVE-2026-54171.yml"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-54171"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Excon does not redact additional sensitive/risky headers when following redirects"
}

CVE-2026-54171 (GCVE-0-2026-54171)

Vulnerability from cvelistv5 – Published: 2026-07-17 20:09 – Updated: 2026-07-20 13:59

Title

Excon: redact additional sensitive/risky headers when following redirects

Summary

Excon is usable, fast, simple HTTP 1.1 for Ruby. Prior to 1.5.0, Excon's RedirectFollower middleware failed to strip additional sensitive headers when following redirects and did not provide a custom list of headers to strip. This could cause inadvertent leakage of sensitive data when the initial request includes header information that is not intended for the new target. This issue is fixed in version 1.5.0.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/excon/excon/security/advisorie…	x_refsource_CONFIRM
https://github.com/excon/excon/pull/901	x_refsource_MISC
https://github.com/excon/excon/commit/ea89a35308a…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
excon	excon	Affected: < 1.5.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54171",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T13:59:31.856340Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T13:59:42.883Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "excon",
          "vendor": "excon",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Excon is usable, fast, simple HTTP 1.1 for Ruby. Prior to 1.5.0, Excon\u0027s RedirectFollower middleware failed to strip additional sensitive headers when following redirects and did not provide a custom list of headers to strip. This could cause inadvertent leakage of sensitive data when the initial request includes header information that is not intended for the new target. This issue is fixed in version 1.5.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201: Insertion of Sensitive Information Into Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T20:09:44.716Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/excon/excon/security/advisories/GHSA-48rx-c7pg-q66r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/excon/excon/security/advisories/GHSA-48rx-c7pg-q66r"
        },
        {
          "name": "https://github.com/excon/excon/pull/901",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/excon/excon/pull/901"
        },
        {
          "name": "https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3"
        }
      ],
      "source": {
        "advisory": "GHSA-48rx-c7pg-q66r",
        "discovery": "UNKNOWN"
      },
      "title": "Excon: redact additional sensitive/risky headers when following redirects"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54171",
    "datePublished": "2026-07-17T20:09:44.716Z",
    "dateReserved": "2026-06-11T21:46:52.381Z",
    "dateUpdated": "2026-07-20T13:59:42.883Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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