CVE intelligence

CVE-2026-18503

Vulnerability intelligence

Published Aug 10, 2026Sources checked Sep 12, 2026

2.4LOWCVSS out of 10

What this means

Review the available evidence

CVE-2026-18503 and is rated Low severity with a CVSS score of 2.4. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.1%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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().