GHSA-3M7F-6HXV-6796中危已审查已撤回

Duplicate Advisory: Pl196xCorpusReader has quadratic ReDoS on malformed TEI blocks

OSV 1.4.0 · github-reviewed · 修改于 2026-09-02 22:49

发布时间

2026-08-28 02:32

GitHub 审查时间

2026-09-02 22:49

NVD 发布时间

2026-08-28 01:21

源文件

advisories/github-reviewed/2026/08/GHSA-3m7f-6hxv-6796/GHSA-3m7f-6hxv-6796.json

该公告已于 2026-09-02 22:49 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This advisory has been withdrawn because it is a duplicate of GHSA-8mpw-7fpc-4gqj. This link is maintained to preserve external references.

Original Description

NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the read_block method through public APIs like words() and tagged_words() to force repeated rescans and achieve near-quadratic runtime growth.

受影响的软件包

PyPI

nltk

ECOSYSTEM

标识信息

别名 / CVE

无

CWE

CWE-400

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:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS_V4

CVSS:4.0/AV:N/AC:H/AT:P/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

原始 OSV JSON

{
  "id": "GHSA-3m7f-6hxv-6796",
  "aliases": [],
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-8mpw-7fpc-4gqj. This link is maintained to preserve external references.\n\n## Original Description\nNLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the read_block method through public APIs like words() and tagged_words() to force repeated rescans and achieve near-quadratic runtime growth.",
  "summary": "Duplicate Advisory: Pl196xCorpusReader has quadratic ReDoS on malformed TEI blocks",
  "affected": [
    {
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.10.2"
            }
          ]
        }
      ],
      "package": {
        "name": "nltk",
        "ecosystem": "PyPI"
      }
    }
  ],
  "modified": "2026-09-02T14:49:56Z",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
    },
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/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"
    }
  ],
  "published": "2026-08-27T18:32:30Z",
  "withdrawn": "2026-09-02T14:49:56Z",
  "references": [
    {
      "url": "https://github.com/nltk/nltk/security/advisories/GHSA-8mpw-7fpc-4gqj",
      "type": "WEB"
    },
    {
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81725",
      "type": "ADVISORY"
    },
    {
      "url": "https://www.vulncheck.com/advisories/nltk-before-3.10.3-regular-expression-denial-of-service-via-pl196xcorpusreader",
      "type": "WEB"
    }
  ],
  "schema_version": "1.4.0",
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "nvd_published_at": "2026-08-27T17:21:03Z",
    "github_reviewed_at": "2026-09-02T14:49:56Z"
  }
}