Ghostwire

CVE-2026-18503: Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume...

LOW CVSS 0.0 Exploit Available

Published: August 10, 2026 | Last Modified: August 10, 2026

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().

Ghostwire Analysis — What This Means Practically

Exploit code is reported to be available, increasing the likelihood of active exploitation.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

Security Coverage (1 articles)

References

www.tenable.com/cve/CVE-2026-18503
www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2026-18503
github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82
github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9
github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a
github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b
github.com/python/cpython/issues/98820
github.com/python/cpython/pull/153694
mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRR