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Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.", "A denial of service attack was discovered against pygments. Some of the regular expressions used to tokenise source code for highlighting have exponential complexity. A specially crafted input file could cause pygments to take effectively infinite time to parse, consuming CPU resources and denying access to the service."], "name": "CVE-2021-27291", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "python-pygments", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python-pygments", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "resource-agents", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Out of support scope", "package_name": "python-pygments", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}], "public_date": "2021-01-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-27291\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-27291"], "threat_severity": "Moderate", "upstream_fix": "python-pygments 2.7.4"}