What is CVE-2026-18503?

CVE-2026-18503 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()

Which CVE IDs does CVE-2026-18503 cover?

CVE-2026-18503 covers the following CVE IDs: CVE-2026-18503. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-18503?

CVE-2026-18503 affects 1 product, including: azl3 python3 3.12.9-14 on Azure Linux 3.0.

CVE-2026-18503Low

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

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-18503 →

🎯 Affected products1

azl3 python3 3.12.9-14 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 3.12.14-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18503
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade