{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55520",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T22:44:22.284Z",
        "datePublished": "2026-08-28T18:42:38.334Z",
        "dateUpdated": "2026-08-28T18:42:38.334Z"
    },
    "containers": {
        "cna": {
            "title": "Protego: Exponential backtracking ReDoS in robots.txt URL wildcard matching",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-400",
                            "lang": "en",
                            "description": "CWE-400: Uncontrolled Resource Consumption",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1333",
                            "lang": "en",
                            "description": "CWE-1333: Inefficient Regular Expression Complexity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH",
                        "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"
                    }
                }
            ],
            "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"
                }
            ],
            "affected": [
                {
                    "vendor": "scrapy",
                    "product": "protego",
                    "versions": [
                        {
                            "version": "< 0.6.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T18:42:38.334Z"
            },
            "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."
                }
            ],
            "source": {
                "advisory": "GHSA-wjmf-p669-5m5p",
                "discovery": "UNKNOWN"
            }
        }
    }
}