Vulnerability-Lookup

PYSEC-2026-2054

Vulnerability from pysec - Published: 2026-07-07 16:03 - Updated: 2026-07-07 17:25

Details

Summary

This issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it's own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High.

Severity

7.5 (High)


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

7.7 (High)


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

Impacted products

Name	purl
xgrammar	pkg:pypi/xgrammar

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "xgrammar",
        "purl": "pkg:pypi/xgrammar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.1.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.1",
        "0.1.10",
        "0.1.11",
        "0.1.12",
        "0.1.13",
        "0.1.14",
        "0.1.15",
        "0.1.16",
        "0.1.17",
        "0.1.18",
        "0.1.19",
        "0.1.2",
        "0.1.20",
        "0.1.3",
        "0.1.4",
        "0.1.4rc2",
        "0.1.5",
        "0.1.5rc1",
        "0.1.6",
        "0.1.7",
        "0.1.8",
        "0.1.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-57809",
    "GHSA-5cmr-4px5-23pc"
  ],
  "details": "### Summary\nThis issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it\u0027s own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High.",
  "id": "PYSEC-2026-2054",
  "modified": "2026-07-07T17:25:52.052578Z",
  "published": "2026-07-07T16:03:01.881040Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-57809"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/issues/250"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mlc-ai/xgrammar"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/xgrammar"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-5cmr-4px5-23pc"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "XGrammar affected by Denial of Service by infinite recursion grammars"
}

CVE-2025-57809 (GCVE-0-2025-57809)

Vulnerability from cvelistv5 – Published: 2025-08-25 21:22 – Updated: 2025-08-26 20:19

Title

XGrammar affected by Denial of Service by infinite recursion grammars

Summary

XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite recursion issue in the grammar. This issue has been resolved in version 0.1.21.

Severity

7.7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-674 - Uncontrolled Recursion

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/mlc-ai/xgrammar/security/advis…	x_refsource_CONFIRM
https://github.com/mlc-ai/xgrammar/issues/250	x_refsource_MISC
https://github.com/mlc-ai/xgrammar/commit/b943fea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
mlc-ai	xgrammar	Affected: < 0.1.21

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-57809",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-08-26T20:19:08.061700Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-08-26T20:19:34.998Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "xgrammar",
          "vendor": "mlc-ai",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.1.21"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite recursion issue in the grammar. This issue has been resolved in version 0.1.21."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-25T21:22:00.226Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc"
        },
        {
          "name": "https://github.com/mlc-ai/xgrammar/issues/250",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mlc-ai/xgrammar/issues/250"
        },
        {
          "name": "https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5"
        }
      ],
      "source": {
        "advisory": "GHSA-5cmr-4px5-23pc",
        "discovery": "UNKNOWN"
      },
      "title": "XGrammar affected by Denial of Service by infinite recursion grammars"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-57809",
    "datePublished": "2025-08-25T21:22:00.226Z",
    "dateReserved": "2025-08-20T14:30:35.010Z",
    "dateUpdated": "2025-08-26T20:19:34.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

GHSA-5CMR-4PX5-23PC

Vulnerability from github – Published: 2025-08-25 20:43 – Updated: 2025-09-10 21:06

Summary

XGrammar affected by Denial of Service by infinite recursion grammars

Details

Summary

Severity

7.5 (High)


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

7.7 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "xgrammar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.1.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-57809"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-25T20:43:45Z",
    "nvd_published_at": "2025-08-25T22:15:33Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThis issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it\u0027s own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High.",
  "id": "GHSA-5cmr-4px5-23pc",
  "modified": "2025-09-10T21:06:51Z",
  "published": "2025-08-25T20:43:45Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-57809"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/issues/250"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mlc-ai/xgrammar"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "XGrammar affected by Denial of Service by infinite recursion grammars"
}

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.

Action not permitted

PYSEC-2026-2054

Summary

CVE-2025-57809 (GCVE-0-2025-57809)

GHSA-5CMR-4PX5-23PC

Summary

Tags

Sightings

Nomenclature