CVE-2026-17501 (GCVE-0-2026-17501)

Vulnerability from cvelistv5 – Published: 2026-07-27 00:30 – Updated: 2026-07-29 04:43
VLAI
Title
ggml-org llama.cpp JSON-Schema-to-GBNF Conversion json-schema-to-grammar.cpp transform recursion
Summary
A flaw has been found in ggml-org llama.cpp e15efe0. This vulnerability affects the function transform of the file common/json-schema-to-grammar.cpp of the component JSON-Schema-to-GBNF Conversion. This manipulation causes uncontrolled recursion. The attack may be initiated remotely. The pull request to fix this issue awaits acceptance.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 17:05 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ggml-org llama.cpp Affected: e15efe0
    cpe:2.3:a:ggml-org:llama.cpp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
m00dy (VulDB User) m00dy (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-17501",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-27T17:05:27.959542Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-27T20:23:44.187Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:ggml-org:llama.cpp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "JSON-Schema-to-GBNF Conversion"
          ],
          "product": "llama.cpp",
          "vendor": "ggml-org",
          "versions": [
            {
              "status": "affected",
              "version": "e15efe0"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "m00dy (VulDB User)"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "m00dy (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw has been found in ggml-org llama.cpp e15efe0. This vulnerability affects the function transform of the file common/json-schema-to-grammar.cpp of the component JSON-Schema-to-GBNF Conversion. This manipulation causes uncontrolled recursion. The attack may be initiated remotely. The pull request to fix this issue awaits acceptance."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 5,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:ND/RC:UR",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-404",
              "description": "Denial of Service",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T04:43:05.523Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-383354 | ggml-org llama.cpp JSON-Schema-to-GBNF Conversion json-schema-to-grammar.cpp transform recursion",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/383354"
        },
        {
          "name": "VDB-383354 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/383354/cti"
        },
        {
          "name": "CVE-2026-17501 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-17501"
        },
        {
          "name": "Submit #798504 | ggml-org llama.cpp (confirmed on commit e15efe0 / tag b8635+1) Uncontrolled Recursion",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/798504"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/ggml-org/llama.cpp/issues/25283"
        },
        {
          "tags": [
            "issue-tracking",
            "patch"
          ],
          "url": "https://github.com/ggml-org/llama.cpp/pull/25308"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/ggml-org/llama.cpp/"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-07-26T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-07-26T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-07-29T06:44:46.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "ggml-org llama.cpp JSON-Schema-to-GBNF Conversion json-schema-to-grammar.cpp transform recursion",
      "x_generator": [
        "VulDB PVTS v202607"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-17501",
    "datePublished": "2026-07-27T00:30:11.082Z",
    "dateReserved": "2026-07-26T17:33:47.225Z",
    "dateUpdated": "2026-07-29T04:43:05.523Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-17501",
      "date": "2026-10-28",
      "epss": "0.00724",
      "percentile": "0.53911"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "cpes": [
                  "cpe:2.3:a:ggml-org:llama.cpp:*:*:*:*:*:*:*:*"
                ],
                "modules": [
                  "JSON-Schema-to-GBNF Conversion"
                ],
                "product": "llama.cpp",
                "vendor": "ggml-org",
                "versions": [
                  {
                    "status": "affected",
                    "version": "e15efe0"
                  }
                ]
              }
            ],
            "source": "cna@vuldb.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A flaw has been found in ggml-org llama.cpp e15efe0. This vulnerability affects the function transform of the file common/json-schema-to-grammar.cpp of the component JSON-Schema-to-GBNF Conversion. This manipulation causes uncontrolled recursion. The attack may be initiated remotely. The pull request to fix this issue awaits acceptance."
          },
          {
            "lang": "es",
            "value": "Se ha encontrado una falla en ggml-org llama.cpp e15efe0. Esta vulnerabilidad afecta a la funci\u00f3n transform del archivo common/json-schema-to-grammar.cpp del componente Conversi\u00f3n de JSON-Schema a GBNF. Esta manipulaci\u00f3n causa la asignaci\u00f3n de recursos. El ataque puede iniciarse remotamente. La solicitud de extracci\u00f3n para solucionar este problema espera aceptaci\u00f3n."
          }
        ],
        "id": "CVE-2026-17501",
        "lastModified": "2026-10-24T13:10:00.147",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "cna@vuldb.com",
              "type": "Secondary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "cna@vuldb.com",
              "type": "Secondary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.9,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "cna@vuldb.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-17501",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-27T17:05:27.959542Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-27T01:16:26.570",
        "references": [
          {
            "source": "cna@vuldb.com",
            "url": "https://github.com/ggml-org/llama.cpp/"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://github.com/ggml-org/llama.cpp/issues/25283"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://github.com/ggml-org/llama.cpp/pull/25308"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://vuldb.com/cve/CVE-2026-17501"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://vuldb.com/submit/798504"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://vuldb.com/vuln/383354"
          },
          {
            "source": "cna@vuldb.com",
            "url": "https://vuldb.com/vuln/383354/cti"
          }
        ],
        "sourceIdentifier": "cna@vuldb.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-404"
              },
              {
                "lang": "en",
                "value": "CWE-674"
              }
            ],
            "source": "cna@vuldb.com",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-07-27T17:27:22+00:00",
      "cve": "CVE-2026-17501",
      "id": "CVE-2026-17501",
      "initial_release_date": "2026-07-27T00:30:11.082000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "llama.cpp: llama.cpp: Denial of Service due to resource allocation manipulation in JSON-Schema-to-GBNF Conversion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-17501.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-17501",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-27T17:05:27.959542Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-27T17:05:37.008Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "cpes": [
                "cpe:2.3:a:ggml-org:llama.cpp:*:*:*:*:*:*:*:*"
              ],
              "modules": [
                "JSON-Schema-to-GBNF Conversion"
              ],
              "product": "llama.cpp",
              "vendor": "ggml-org",
              "versions": [
                {
                  "status": "affected",
                  "version": "e15efe0"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "m00dy (VulDB User)"
            },
            {
              "lang": "en",
              "type": "analyst",
              "value": "m00dy (VulDB User)"
            },
            {
              "lang": "en",
              "type": "coordinator",
              "value": "VulDB CNA Team"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A flaw has been found in ggml-org llama.cpp e15efe0. This vulnerability affects the function transform of the file common/json-schema-to-grammar.cpp of the component JSON-Schema-to-GBNF Conversion. This manipulation causes uncontrolled recursion. The attack may be initiated remotely. The pull request to fix this issue awaits acceptance."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "baseScore": 6.9,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X",
                "version": "4.0"
              }
            },
            {
              "cvssV3_1": {
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R",
                "version": "3.1"
              }
            },
            {
              "cvssV3_0": {
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R",
                "version": "3.0"
              }
            },
            {
              "cvssV2_0": {
                "baseScore": 5,
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:ND/RC:UR",
                "version": "2.0"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-674",
                  "description": "Uncontrolled Recursion",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-404",
                  "description": "Denial of Service",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-29T04:43:05.523Z",
            "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
            "shortName": "VulDB"
          },
          "references": [
            {
              "name": "VDB-383354 | ggml-org llama.cpp JSON-Schema-to-GBNF Conversion json-schema-to-grammar.cpp transform recursion",
              "tags": [
                "vdb-entry",
                "technical-description"
              ],
              "url": "https://vuldb.com/vuln/383354"
            },
            {
              "name": "VDB-383354 | CTI Indicators (IOB, IOC, TTP, IOA)",
              "tags": [
                "signature",
                "permissions-required"
              ],
              "url": "https://vuldb.com/vuln/383354/cti"
            },
            {
              "name": "CVE-2026-17501 | CVE Analysis and Report",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://vuldb.com/cve/CVE-2026-17501"
            },
            {
              "name": "Submit #798504 | ggml-org llama.cpp (confirmed on commit e15efe0 / tag b8635+1) Uncontrolled Recursion",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://vuldb.com/submit/798504"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/ggml-org/llama.cpp/issues/25283"
            },
            {
              "tags": [
                "issue-tracking",
                "patch"
              ],
              "url": "https://github.com/ggml-org/llama.cpp/pull/25308"
            },
            {
              "tags": [
                "product"
              ],
              "url": "https://github.com/ggml-org/llama.cpp/"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-26T00:00:00.000Z",
              "value": "Advisory disclosed"
            },
            {
              "lang": "en",
              "time": "2026-07-26T02:00:00.000Z",
              "value": "VulDB entry created"
            },
            {
              "lang": "en",
              "time": "2026-07-29T06:44:46.000Z",
              "value": "VulDB entry last update"
            }
          ],
          "title": "ggml-org llama.cpp JSON-Schema-to-GBNF Conversion json-schema-to-grammar.cpp transform recursion",
          "x_generator": [
            "VulDB PVTS v202607"
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "assignerShortName": "VulDB",
        "cveId": "CVE-2026-17501",
        "datePublished": "2026-07-27T00:30:11.082Z",
        "dateReserved": "2026-07-26T17:33:47.225Z",
        "dateUpdated": "2026-07-29T04:43:05.523Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.