{"id":"CVE-2026-18503","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-18503","generatedAt":"2026-10-28T04:16:54.794Z","title":"Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().","description":"Attacker-controlled CSV samples can trigger super-linear \nregular-expression work during dialect sniffing and consume significant \nCPU when applications pass unbounded input to csv.Sniffer.sniff().","published":"2026-08-10T14:17:22.000Z","lastModified":"2026-10-23T20:10:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"cna@python.org","cvss":{"version":"4.0","score":2.4,"severity":"LOW","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1176"],"affected":[],"epss":{"score":0.00119,"percentile":0.0177,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82","source":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9","source":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a","source":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024","source":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b","source":"cna@python.org"},{"url":"https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4","source":"cna@python.org"},{"url":"https://github.com/python/cpython/issues/98820","source":"cna@python.org"},{"url":"https://github.com/python/cpython/pull/153694","source":"cna@python.org"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/","source":"cna@python.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-18503","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}