GHSA-QG9P-XRHJ-435M中危已审查已撤回

Duplicate Advisory: nltk: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

OSV 1.4.0 · github-reviewed · 修改于 2026-09-02 23:38

发布时间

2026-08-22 23:31

GitHub 审查时间

2026-09-02 23:38

NVD 发布时间

2026-08-22 23:16

源文件

advisories/github-reviewed/2026/08/GHSA-qg9p-xrhj-435m/GHSA-qg9p-xrhj-435m.json

该公告已于 2026-09-02 23:38 撤回

内容仅用于保留外部引用，请不要将其当作仍然有效的安全结论。

公告说明

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-3gqm-fcw5-w839. This link is maintained to preserve external references.

Original Description

NLTK before 3.10.0 (affected versions <= 3.9.4) contains a server-side request forgery (SSRF) vulnerability in the validate_network_url() function in nltk/pathsec.py. The _resolve_hostname() helper catches OSError and ValueError during socket.getaddrinfo() and returns an empty list; when DNS resolution fails, the validation loop executes no IP checks and the function fails open, allowing urlopen() to proceed without validation. An attacker who can trigger DNS resolution failures or use DNS rebinding can bypass SSRF protections and reach restricted network resources, including cloud metadata endpoints (e.g., 169.254.169.254).

受影响的软件包

PyPI

nltk

ECOSYSTEM

标识信息

别名 / CVE

无

CWE

CWE-918

软件生态

PyPI

扩展资料

暂无扩展资料。

CVSS 评分

CVSS_V3

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

CVSS_V4

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

原始 OSV JSON

{
  "id": "GHSA-qg9p-xrhj-435m",
  "aliases": [],
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-3gqm-fcw5-w839. This link is maintained to preserve external references.\n\n## Original Description\nNLTK before 3.10.0 (affected versions <= 3.9.4) contains a server-side request forgery (SSRF) vulnerability in the validate_network_url() function in nltk/pathsec.py. The _resolve_hostname() helper catches OSError and ValueError during socket.getaddrinfo() and returns an empty list; when DNS resolution fails, the validation loop executes no IP checks and the function fails open, allowing urlopen() to proceed without validation. An attacker who can trigger DNS resolution failures or use DNS rebinding can bypass SSRF protections and reach restricted network resources, including cloud metadata endpoints (e.g., 169.254.169.254).",
  "summary": "Duplicate Advisory: nltk: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure",
  "affected": [
    {
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.9.4"
            }
          ]
        }
      ],
      "package": {
        "name": "nltk",
        "ecosystem": "PyPI"
      }
    }
  ],
  "modified": "2026-09-02T15:38:15Z",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
    },
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L"
    }
  ],
  "published": "2026-08-22T15:31:03Z",
  "withdrawn": "2026-09-02T15:38:15Z",
  "references": [
    {
      "url": "https://github.com/nltk/nltk/security/advisories/GHSA-3gqm-fcw5-w839",
      "type": "WEB"
    },
    {
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63311",
      "type": "ADVISORY"
    },
    {
      "url": "https://www.vulncheck.com/advisories/nltk-before-ssrf-via-dns-resolution-failure",
      "type": "WEB"
    }
  ],
  "schema_version": "1.4.0",
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "nvd_published_at": "2026-08-22T15:16:19Z",
    "github_reviewed_at": "2026-09-02T15:38:15Z"
  }
}