Vulnerability-Lookup

PYSEC-2026-3539

Vulnerability from pysec - Published: 2026-07-23 11:41 - Updated: 2026-07-23 14:33

Details

sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.

Severity

6.5 (Medium)


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

Impacted products

Name	purl
sanic-cors	pkg:pypi/sanic-cors

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sanic-cors",
        "purl": "pkg:pypi/sanic-cors"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.0",
        "0.10.0.post1",
        "0.10.0.post2",
        "0.10.0.post3",
        "0.10.0b1",
        "0.4.1",
        "0.4.1.2",
        "0.4.1.4",
        "0.5.1.0",
        "0.5.4.1",
        "0.5.4.2",
        "0.6.0.0",
        "0.6.0.1",
        "0.6.0.2",
        "0.9.0",
        "0.9.1",
        "0.9.2",
        "0.9.3",
        "0.9.4",
        "0.9.5",
        "0.9.6",
        "0.9.7",
        "0.9.8",
        "0.9.8.post1",
        "0.9.8.post2",
        "0.9.8.post3",
        "0.9.9",
        "0.9.9.post1",
        "0.9.9.post2",
        "0.9.9.post3",
        "0.9.9.post4",
        "1.0.0",
        "1.0.1",
        "2.0.0",
        "2.0.1",
        "2.1.0",
        "2.2.0",
        "2.2.0b1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-37737",
    "GHSA-94jw-hqvj-vw74"
  ],
  "details": "sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.",
  "id": "PYSEC-2026-3539",
  "modified": "2026-07-23T14:33:03.280301Z",
  "published": "2026-07-23T11:41:39.408627Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-37737"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ashleysommer/sanic-cors"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/Sanic-Cors"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/sanic-cors"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-94jw-hqvj-vw74"
    }
  ],
  "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": "sanic-cors contains an improper regular expression in the try_match() function"
}

CVE-2026-37737 (GCVE-0-2026-37737)

Vulnerability from cvelistv5 – Published: 2026-06-05 00:00 – Updated: 2026-06-05 20:15

Summary

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-06-05 20:14 UTC

CWE

n/a
CWE-625 - Permissive Regular Expression
CWE-346 - Origin Validation Error

Assigner

mitre mitre root

References

4 references

URL	Tags
https://github.com/ashleysommer/sanic-cors/blob/m…
https://github.com/ashleysommer/sanic-cors
https://pypi.org/project/Sanic-Cors/
https://github.com/npbhatter17/security-advisorie…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-37737",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-05T20:14:32.367415Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-625",
                "description": "CWE-625 Permissive Regular Expression",
                "lang": "en",
                "type": "CWE"
              }
            ]
          },
          {
            "descriptions": [
              {
                "cweId": "CWE-346",
                "description": "CWE-346 Origin Validation Error",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-05T20:15:39.697Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T13:56:15.693Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"
        },
        {
          "url": "https://github.com/ashleysommer/sanic-cors"
        },
        {
          "url": "https://pypi.org/project/Sanic-Cors/"
        },
        {
          "url": "https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-37737",
    "datePublished": "2026-06-05T00:00:00.000Z",
    "dateReserved": "2026-04-06T00:00:00.000Z",
    "dateUpdated": "2026-06-05T20:15:39.697Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-94JW-HQVJ-VW74

Vulnerability from github – Published: 2026-06-05 15:32 – Updated: 2026-07-17 17:05

Summary

sanic-cors contains an improper regular expression in the try_match() function

Details

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sanic-cors"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-37737"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-17T17:05:30Z",
    "nvd_published_at": "2026-06-05T15:16:51Z",
    "severity": "MODERATE"
  },
  "details": "sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.",
  "id": "GHSA-94jw-hqvj-vw74",
  "modified": "2026-07-17T17:05:30Z",
  "published": "2026-06-05T15:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-37737"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ashleysommer/sanic-cors"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/Sanic-Cors"
    }
  ],
  "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": "sanic-cors contains an improper regular expression in the try_match() function"
}

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.

Action not permitted

PYSEC-2026-3539

CVE-2026-37737 (GCVE-0-2026-37737)

GHSA-94JW-HQVJ-VW74

Tags

Sightings

Nomenclature