Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()
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().
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-18503US | — | — | ||
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… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82WEB
- https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9WEB
- https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946aWEB
- https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024WEB
- https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693bWEB
- https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4WEB
- https://github.com/python/cpython/issues/98820WEB
- https://github.com/python/cpython/pull/153694WEB
scry
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