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Grav before 2.0.2 Decompression Bomb via Forged ZIP Size

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-61449
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 18:25 UTC · Revision 1

Source evidence

Grav before 2.0.2 Decompression Bomb via Forged ZIP Size

core-osv · Original source

Published 15 Jul 2026, 11:25 UTC

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.

osv:CVE-2026-61449
Complete source record
{
  "id": "9582af458fe363fb2e85056ac5d482e9a4ace628a16335237d5ffcdc6185af1e",
  "url": "https://osv.dev/vulnerability/CVE-2026-61449",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-61449",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-61449",
      "aliases": [
        "CVE-2026-61449",
        "GHSA-8h9x-89f2-m7x3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getgrav/grav",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cc9971b6efa43bc797d3c593f69020a6b7335817"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.0.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.0.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.1",
            "1.7.53",
            "1.7.52",
            "1.7.51",
            "1.7.39.1",
            "1.7.39",
            "1.7.38",
            "1.7.37.1",
            "1.7.37",
            "1.7.36",
            "1.7.35",
            "1.7.34",
            "1.7.33",
            "1.7.32",
            "1.7.31",
            "1.7.30",
            "1.7.29.1",
            "1.7.29",
            "1.7.28",
            "1.7.27.1",
            "1.7.27",
            "1.7.26.1",
            "1.7.26",
            "1.7.25",
            "1.7.24",
            "1.7.23",
            "1.7.22",
            "1.7.21",
            "1.7.20",
            "1.7.19",
            "1.7.18",
            "1.7.17",
            "1.7.16",
            "1.7.15",
            "1.7.14",
            "1.7.13",
            "1.7.12",
            "1.7.10",
            "1.7.9",
            "1.7.8",
            "1.7.7",
            "1.7.6",
            "1.7.5",
            "1.7.4",
            "1.7.3",
            "1.7.1",
            "1.7.0",
            "1.7.0-rc.20",
            "1.7.0-rc.19",
            "1.7.0-rc.18",
            "1.7.0-rc.17",
            "1.7.0-rc.15",
            "1.7.0-rc.14",
            "1.7.0-rc.13",
            "1.7.0-rc.12",
            "1.7.0-rc.10",
            "1.7.0-rc.9",
            "1.7.0-rc.8",
            "1.7.0-rc.7",
            "1.7.0-rc.6",
            "1.7.0-rc.5",
            "1.7.0-rc.4",
            "1.7.0-rc.3",
            "1.7.0-rc.2",
            "1.7.0-rc.1",
            "1.7.0-beta.10",
            "1.7.0-beta.9",
            "1.7.0-beta.8",
            "1.7.0-beta.7",
            "1.7.0-beta.6",
            "1.7.0-beta.5",
            "1.7.0-beta.4",
            "1.7.0-beta.3",
            "1.7.0-beta.2",
            "1.7.0-beta.1",
            "1.6.0-rc.4",
            "1.6.0-rc.3",
            "1.6.0-rc.2",
            "1.6.0-rc.1",
            "1.6.0-beta.8",
            "1.6.0-beta.7",
            "1.6.0-beta.6",
            "1.6.0-beta.5",
            "1.6.0-beta.2",
            "1.6.0-beta.1",
            "1.5.0-rc.1",
            "1.5.0-beta.2",
            "1.5.0-beta.1",
            "1.3.0-rc.5",
            "1.3.0-rc.4",
            "1.3.0-rc.3",
            "1.3.0-rc.1",
            "1.2.0-rc.3",
            "1.2.0-rc.2",
            "1.2.0-rc.1",
            "1.1.9-rc.3",
            "1.1.9-rc.2",
            "1.1.9-rc.1",
            "1.1.0-rc.3",
            "1.1.0-rc.2",
            "1.1.0-rc.1",
            "1.1.0-beta.5",
            "1.1.0-beta.4",
            "1.1.0-beta.3",
            "1.1.0-beta.2",
            "1.1.0-beta.1",
            "0.9.19",
            "0.9.18",
            "0.9.17",
            "0.9.16",
            "0.9.15",
            "0.9.14",
            "0.9.13",
            "0.9.12",
            "0.9.11",
            "0.9.10",
            "0.9.9",
            "0.9.8",
            "0.9.7",
            "0.9.6",
            "0.9.5",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.0",
            "0.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61449.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.022885511Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61449.json",
        "https://github.com/getgrav/grav/security/advisories/GHSA-8h9x-89f2-m7x3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-61449",
        "https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-forged-zip-size"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-409"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61449.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-61449",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488342,
  "published_at": "2026-07-15T11:25:43.802+00:00"
}