Vulnerability in Python Software Foundation Cpython
CVE-2026-18503
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().
Affected products
- Python Software Foundation Cpython — versions 3.14.0, 0, 3.15.0a1
Weakness classification (CWE)
References
- cna@python.org (issue-tracking)
- cna@python.org (patch)
- cna@python.org (vendor-advisory)
- cna@python.org (patch)
- cna@python.org (patch)
- cna@python.org (patch)
- cna@python.org (patch)