{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "protego",
          "vendor": "scrapy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.6.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Protego is a pure-Python robots.txt parser with support for modern conventions. Prior to 0.6.2, protego._urlpattern._URLPattern._prepare_pattern_for_regex translates every asterisk in an Allow or Disallow directive into a lazy regular-expression wildcard, so a directive containing many asterisks creates exponential backtracking. After protego.Protego.parse processes a crafted robots.txt file, protego.Protego.can_fetch can spend an attacker-controlled period matching a near-miss URL and deny service to the crawler. The vulnerable path is src/protego/_urlpattern.py in the _URLPattern match logic. This issue is fixed in version 0.6.2."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T18:42:38.334Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/scrapy/protego/security/advisories/GHSA-wjmf-p669-5m5p",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/scrapy/protego/security/advisories/GHSA-wjmf-p669-5m5p"
        },
        {
          "name": "https://github.com/scrapy/protego/commit/785940181659bf440ba82f1da148fade5087e858",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/scrapy/protego/commit/785940181659bf440ba82f1da148fade5087e858"
        },
        {
          "name": "https://github.com/scrapy/protego/releases/tag/0.6.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/scrapy/protego/releases/tag/0.6.2"
        }
      ],
      "source": {
        "advisory": "GHSA-wjmf-p669-5m5p",
        "discovery": "UNKNOWN"
      },
      "title": "Protego: Exponential backtracking ReDoS in robots.txt URL wildcard matching"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55520",
    "datePublished": "2026-08-28T18:42:38.334Z",
    "dateReserved": "2026-06-16T22:44:22.284Z",
    "dateUpdated": "2026-08-28T18:42:38.334Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}