Vulnerability-Lookup

UBUNTU-CVE-2026-119285 (CVE-2026-119285)

Vulnerability from osv_ubuntu – Published: 2026-10-30 00:00 – Updated: 2026-10-30 00:00 – Source website

Details

Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware's validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker's page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3.

Severity

5.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-119285	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-119285	REPORT
	https://github.com/gofiber/fiber/commit/1aac6f618…	REPORT
	https://github.com/gofiber/fiber/pull/2915	REPORT
	https://github.com/gofiber/fiber/releases/tag/v2.52.3	REPORT
	https://github.com/gofiber/fiber/security/advisor…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gofiber-fiber-dev",
            "binary_version": "3.5.0-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "golang-github-gofiber-fiber",
        "purl": "pkg:deb/ubuntu/golang-github-gofiber-fiber@3.5.0-4?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.0-1",
        "3.4.0-1",
        "3.5.0-1",
        "3.5.0-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gofiber-fiber-v2-dev",
            "binary_version": "2.52.13-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "golang-github-gofiber-fiber-v2",
        "purl": "pkg:deb/ubuntu/golang-github-gofiber-fiber-v2@2.52.13-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.52.13-2",
        "2.52.13-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware\u0027s validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker\u0027s page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3.",
  "id": "UBUNTU-CVE-2026-119285",
  "modified": "2026-10-30T00:00:00Z",
  "published": "2026-10-30T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-119285"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-119285"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gofiber/fiber/commit/1aac6f618b6bd3e159d2449acb4232a2170b976b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gofiber/fiber/pull/2915"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-g5jq-qmqr-qrwf"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-119285"
  ]
}

CVE-2026-119285 (GCVE-0-2026-119285)

Vulnerability from cvelistv5 – Published: 2026-10-29 21:36 – Updated: 2026-10-29 21:36

Title

Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads

Summary

Severity

5.9 (Medium)


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

CWE

CWE-346 - Origin Validation Error
CWE-942 - Permissive Cross-domain Policy with Untrusted Domains

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8129 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/gofiber/fiber/security/advisor…	x_refsource_CONFIRM
https://github.com/gofiber/fiber/pull/2915	x_refsource_MISC
https://github.com/gofiber/fiber/commit/1aac6f618…	x_refsource_MISC
https://github.com/gofiber/fiber/releases/tag/v2.52.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gofiber	fiber	Affected: >= 2.52.1, < 2.52.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "fiber",
          "vendor": "gofiber",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.52.1, \u003c 2.52.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware\u0027s validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker\u0027s page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-346",
              "description": "CWE-346: Origin Validation Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-942",
              "description": "CWE-942: Permissive Cross-domain Policy with Untrusted Domains",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-29T21:36:02.199Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gofiber/fiber/security/advisories/GHSA-g5jq-qmqr-qrwf",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gofiber/fiber/security/advisories/GHSA-g5jq-qmqr-qrwf"
        },
        {
          "name": "https://github.com/gofiber/fiber/pull/2915",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gofiber/fiber/pull/2915"
        },
        {
          "name": "https://github.com/gofiber/fiber/commit/1aac6f618b6bd3e159d2449acb4232a2170b976b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gofiber/fiber/commit/1aac6f618b6bd3e159d2449acb4232a2170b976b"
        },
        {
          "name": "https://github.com/gofiber/fiber/releases/tag/v2.52.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gofiber/fiber/releases/tag/v2.52.3"
        }
      ],
      "source": {
        "advisory": "GHSA-g5jq-qmqr-qrwf",
        "discovery": "UNKNOWN"
      },
      "title": "Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-119285",
    "datePublished": "2026-10-29T21:36:02.199Z",
    "dateReserved": "2026-10-29T18:50:28.065Z",
    "dateUpdated": "2026-10-29T21:36:02.199Z",
    "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.

Vulnerability timeline

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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.

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