PYSEC-2026-1805

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

A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages.

Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.

Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Impacted products
Name purl
protobuf pkg:pypi/protobuf
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "protobuf",
        "purl": "pkg:pypi/protobuf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.29.6"
            },
            {
              "introduced": "6.30.0rc1"
            },
            {
              "fixed": "6.33.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0beta",
        "2.0.3",
        "2.3.0",
        "2.4.1",
        "2.5.0",
        "2.6.0",
        "2.6.1",
        "3.0.0",
        "3.0.0a2",
        "3.0.0a3",
        "3.0.0b1",
        "3.0.0b1.post1",
        "3.0.0b1.post2",
        "3.0.0b2",
        "3.0.0b2.post1",
        "3.0.0b2.post2",
        "3.0.0b3",
        "3.0.0b4",
        "3.1.0",
        "3.1.0.post1",
        "3.10.0",
        "3.10.0rc1",
        "3.11.0",
        "3.11.0rc1",
        "3.11.0rc2",
        "3.11.1",
        "3.11.2",
        "3.11.3",
        "3.12.0",
        "3.12.0rc1",
        "3.12.0rc2",
        "3.12.1",
        "3.12.2",
        "3.12.4",
        "3.13.0",
        "3.13.0rc3",
        "3.14.0",
        "3.14.0rc1",
        "3.14.0rc2",
        "3.14.0rc3",
        "3.15.0",
        "3.15.0rc1",
        "3.15.0rc2",
        "3.15.1",
        "3.15.2",
        "3.15.3",
        "3.15.4",
        "3.15.5",
        "3.15.6",
        "3.15.7",
        "3.15.8",
        "3.16.0",
        "3.16.0rc1",
        "3.16.0rc2",
        "3.17.0",
        "3.17.0rc1",
        "3.17.0rc2",
        "3.17.1",
        "3.17.2",
        "3.17.3",
        "3.18.0",
        "3.18.0rc1",
        "3.18.0rc2",
        "3.18.1",
        "3.18.3",
        "3.19.0",
        "3.19.0rc1",
        "3.19.0rc2",
        "3.19.1",
        "3.19.2",
        "3.19.3",
        "3.19.4",
        "3.19.5",
        "3.19.6",
        "3.2.0",
        "3.2.0rc1",
        "3.2.0rc1.post1",
        "3.2.0rc2",
        "3.20.0",
        "3.20.0rc1",
        "3.20.0rc2",
        "3.20.1",
        "3.20.1rc1",
        "3.20.2",
        "3.20.3",
        "3.3.0",
        "3.4.0",
        "3.5.0.post1",
        "3.5.1",
        "3.5.2",
        "3.5.2.post1",
        "3.6.0",
        "3.6.1",
        "3.7.0",
        "3.7.0rc2",
        "3.7.0rc3",
        "3.7.1",
        "3.8.0",
        "3.8.0rc1",
        "3.9.0",
        "3.9.0rc1",
        "3.9.1",
        "3.9.2",
        "4.0.0rc1",
        "4.0.0rc2",
        "4.21.0",
        "4.21.0rc1",
        "4.21.0rc2",
        "4.21.1",
        "4.21.10",
        "4.21.11",
        "4.21.12",
        "4.21.2",
        "4.21.3",
        "4.21.4",
        "4.21.5",
        "4.21.6",
        "4.21.7",
        "4.21.8",
        "4.21.9",
        "4.22.0",
        "4.22.0rc1",
        "4.22.0rc2",
        "4.22.0rc3",
        "4.22.1",
        "4.22.3",
        "4.22.4",
        "4.22.5",
        "4.23.0",
        "4.23.0rc2",
        "4.23.0rc3",
        "4.23.1",
        "4.23.2",
        "4.23.3",
        "4.23.4",
        "4.24.0",
        "4.24.0rc1",
        "4.24.0rc2",
        "4.24.0rc3",
        "4.24.1",
        "4.24.2",
        "4.24.3",
        "4.24.4",
        "4.25.0",
        "4.25.0rc1",
        "4.25.0rc2",
        "4.25.1",
        "4.25.2",
        "4.25.3",
        "4.25.4",
        "4.25.5",
        "4.25.6",
        "4.25.7",
        "4.25.8",
        "4.25.9",
        "5.26.0",
        "5.26.0rc1",
        "5.26.0rc2",
        "5.26.0rc3",
        "5.26.1",
        "5.27.0",
        "5.27.0rc1",
        "5.27.0rc2",
        "5.27.0rc3",
        "5.27.1",
        "5.27.2",
        "5.27.3",
        "5.27.4",
        "5.27.5",
        "5.28.0",
        "5.28.0rc1",
        "5.28.0rc2",
        "5.28.0rc3",
        "5.28.1",
        "5.28.2",
        "5.28.3",
        "5.29.0",
        "5.29.0rc1",
        "5.29.0rc2",
        "5.29.0rc3",
        "5.29.1",
        "5.29.2",
        "5.29.3",
        "5.29.4",
        "5.29.5",
        "6.30.0",
        "6.30.0rc1",
        "6.30.0rc2",
        "6.30.1",
        "6.30.2",
        "6.31.0",
        "6.31.0rc1",
        "6.31.0rc2",
        "6.31.1",
        "6.32.0",
        "6.32.0rc1",
        "6.32.0rc2",
        "6.32.1",
        "6.33.0",
        "6.33.0rc1",
        "6.33.0rc2",
        "6.33.1",
        "6.33.2",
        "6.33.3",
        "6.33.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-0994",
    "GHSA-7gcm-g887-7qv7"
  ],
  "details": "A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages.\n\nDue to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python\u2019s recursion stack and causing a RecursionError.",
  "id": "PYSEC-2026-1805",
  "modified": "2026-07-07T17:25:09.134680Z",
  "published": "2026-07-07T16:03:20.164682Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0994"
    },
    {
      "type": "WEB",
      "url": "https://github.com/protocolbuffers/protobuf/issues/25070"
    },
    {
      "type": "WEB",
      "url": "https://github.com/protocolbuffers/protobuf/pull/25239"
    },
    {
      "type": "WEB",
      "url": "https://github.com/protocolbuffers/protobuf/commit/5ebddcb1bcbe51d1fe323baa145e85f4f23128cf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/protocolbuffers/protobuf/commit/d2b001626d137c62dfee6c88c87324102531868b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/protocolbuffers/protobuf"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/protobuf"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-7gcm-g887-7qv7"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "protobuf affected by a JSON recursion depth bypass"
}


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