CVE-2026-49452

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{"affected": [{"affectedData": [{"product": "WeasyPrint", "vendor": "Kozea", "versions": [{"status": "affected", "version": "< 69.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/__init__.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0."}, {"lang": "es", "value": "WeasyPrint ayuda a los desarrolladores web a crear documentos PDF. Antes de la versi\u00f3n 69.0, WeasyPrint incrusta valores de atributos de sugerencia presentacional HTML sin escapar en CSS en weasyprint/css/__init__.py cuando presentational_hints=True. El atributo background se inserta en una declaraci\u00f3n background-image:url() y es analizado por tinycss2.parse_blocks_contents(), permitiendo que HTML no confiable inyecte declaraciones CSS adicionales. Las aplicaciones que renderizan HTML no confiable con las sugerencias presentacionales habilitadas pueden verse afectadas por inyecci\u00f3n CSS y solicitudes del lado del servidor a trav\u00e9s de valores url() inyectados. Este problema se ha solucionado en la versi\u00f3n 69.0."}], "id": "CVE-2026-49452", "lastModified": "2026-10-22T22:10:00.250", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49452", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T15:12:11.871495Z", "version": "2.0.3"}}]}, "published": "2026-08-18T18:17:49.147", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Kozea/WeasyPrint/commit/e158264e33fa399b29f415d30719c1d85a55df1d"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kozea/WeasyPrint/pull/2773"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kozea/WeasyPrint/releases/tag/v69.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-74"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "weasyprint: WeasyPrint: CSS Injection via Presentational Hints", "id": "2518129", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2518129"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/__init__.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0.", "A flaw was found in WeasyPrint, a tool designed to create PDF documents from web content. When processing untrusted HTML with presentational hints enabled, WeasyPrint embeds unescaped HTML attribute values directly into CSS declarations. This vulnerability allows a remote attacker to inject arbitrary CSS, potentially leading to information disclosure or the initiation of server-side requests through specially crafted url() values."], "mitigation": {"lang": "en:us", "value": "Escape attribute values before embedding into CSS, and restrict allowed values for presentational hints."}, "name": "CVE-2026-49452", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform/automation-dashboard-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}], "public_date": "2026-08-18T17:59:36Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-49452\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-49452\nhttps://github.com/Kozea/WeasyPrint/commit/e158264e33fa399b29f415d30719c1d85a55df1d\nhttps://github.com/Kozea/WeasyPrint/pull/2773\nhttps://github.com/Kozea/WeasyPrint/releases/tag/v69.0\nhttps://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5"], "statement": "Red Hat Ansible Automation Platform 2.5 ships WeasyPrint 69.0, which already includes the fix for this vulnerability, and is therefore not affected. The WeasyPrint package in EPEL ships a version within the vulnerable range.", "threat_severity": "Moderate"}

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