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().
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 12 Aug 2026 00:45:00 +0000


Tue, 11 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Mon, 10 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 10 Aug 2026 14:45:00 +0000


Mon, 10 Aug 2026 14:15:00 +0000

Type Values Removed Values Added
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().
Title Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()
Weaknesses CWE-1176
References
Metrics cvssV4_0

{'score': 2.4, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-08-13T00:28:22.443Z

Reserved: 2026-07-31T16:35:42.902Z

Link: CVE-2026-18503

cve-icon Vulnrichment

Updated: 2026-08-10T17:56:23.854Z

cve-icon NVD

Status : Received

Published: 2026-08-10T14:17:21.560

Modified: 2026-08-13T01:16:52.260

Link: CVE-2026-18503

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-11T14:22:43Z

Weaknesses