{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71478", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-06T19:56:23.724Z", "datePublished": "2026-08-06T20:30:32.045Z", "dateUpdated": "2026-08-06T20:30:32.045Z"}, "containers": {"cna": {"title": "league/commonmark: AttributesExtension href/src unsafe-link filter bypass via embedded control bytes", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-86", "lang": "en", "description": "CWE-86: Improper Neutralization of Invalid Characters in Identifiers in Web Pages", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-692", "lang": "en", "description": "CWE-692: Incomplete Denylist to Cross-Site Scripting", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/thephpleague/commonmark/security/advisories/GHSA-29pj-957v-52mc", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/thephpleague/commonmark/security/advisories/GHSA-29pj-957v-52mc"}, {"name": "https://github.com/thephpleague/commonmark/commit/493a5aa7d65754b73846006eaff9c2c4431a8e2c", "tags": ["x_refsource_MISC"], "url": "https://github.com/thephpleague/commonmark/commit/493a5aa7d65754b73846006eaff9c2c4431a8e2c"}, {"name": "https://github.com/thephpleague/commonmark/releases/tag/2.9.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/thephpleague/commonmark/releases/tag/2.9.0"}], "affected": [{"vendor": "thephpleague", "product": "commonmark", "versions": [{"version": ">= 1.5.0, <= 2.8.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-06T20:30:32.045Z"}, "descriptions": [{"lang": "en", "value": "league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 1.5.0 until 2.9.0, the AttributesExtension's href and src unsafe-link filter can be bypassed by embedding control bytes, such as a tab, carriage return, line feed, or leading C0 control character, in a javascript: URL that browsers discard before parsing the scheme, causing the browser to still execute the script even when the unsafe-link filter is enabled. This issue is fixed in 2.9.0."}], "source": {"advisory": "GHSA-29pj-957v-52mc", "discovery": "UNKNOWN"}}}}

{}

{}

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{}