{"id":"BIT-python-min-2026-18503","summary":"Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()","details":"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().","aliases":["BIT-libpython-2026-18503","BIT-python-2026-18503","CVE-2026-18503","PSF-2026-35"],"modified":"2026-08-17T08:11:03.417697038Z","published":"2026-08-17T05:54:54.838Z","database_specific":{"severity":"Low","cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82"},{"type":"WEB","url":"https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9"},{"type":"WEB","url":"https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a"},{"type":"WEB","url":"https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024"},{"type":"WEB","url":"https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b"},{"type":"WEB","url":"https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4"},{"type":"WEB","url":"https://github.com/python/cpython/issues/98820"},{"type":"WEB","url":"https://github.com/python/cpython/pull/153694"},{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18503"}],"affected":[{"package":{"name":"python-min","ecosystem":"Bitnami","purl":"pkg:bitnami/python-min"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.10.21"},{"introduced":"3.11.0"},{"fixed":"3.11.16"},{"introduced":"3.12.0"},{"fixed":"3.12.14"},{"introduced":"3.13.0"},{"fixed":"3.13.15"},{"introduced":"3.14.0"},{"fixed":"3.14.7"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/python-min/BIT-python-min-2026-18503.json"},"severity":[{"type":"CVSS_V4","score":"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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}