{"id":"UBUNTU-CVE-2016-9954","details":"The backtrack compilation code in the Irregex package (aka IrRegular Expressions) before 0.9.6 for Scheme allows remote attackers to cause a denial of service (memory consumption) via a crafted regular expression with a repeating pattern.","modified":"2025-10-24T04:45:59Z","published":"2017-04-21T20:59:00Z","upstream":["CVE-2016-9954"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-9954"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2016/12/14/18"},{"type":"REPORT","url":"https://github.com/ashinn/irregex/commit/a16ffc86eca15fca9e40607d41de3cea9cf868f1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-9954"}],"affected":[{"package":{"name":"chicken","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/chicken@4.9.0.1-1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.0.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.9.0.1-1","binary_name":"chicken-bin"},{"binary_version":"4.9.0.1-1","binary_name":"libchicken-dev"},{"binary_version":"4.9.0.1-1","binary_name":"libchicken7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-9954.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}