Low severityNVD Advisory· Published Aug 10, 2026· Updated Aug 10, 2026
CVE-2026-18503
CVE-2026-18503
Description
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().
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Affected products
1Patches
Vulnerability mechanics
References
7- github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82nvd
- github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9nvd
- github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946anvd
- github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693bnvd
- github.com/python/cpython/issues/98820nvd
- github.com/python/cpython/pull/153694nvd
- mail.python.org/archives/list/[email protected]/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/nvd
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