CVE-2026-18503

Low

Open

TLP:CLEAR

Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()

NVD CVE.org

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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().

Details

CVSS Score: 2.4
EPSS Score ⓘ: 0.12%

2.1th percentile
CVSS 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
Confidence: 90%
Published: Aug 10, 2026
Last Modified: Aug 12, 2026

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