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CVE-2026-18503

Published Aug 10, 2026 CWE-1176

Overview

CVE-2026-18503 is a known-severity vulnerability. It was published on August 10, 2026.

Technical 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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHub github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82 GitHub github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9 GitHub github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a GitHub github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024 GitHub github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b GitHub github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4 GitHub github.com/python/cpython/issues/98820 GitHub github.com/python/cpython/pull/153694 Ref mail.python.org/archives/list/[email protected]/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/

Frequently Asked Questions

What is CVE-2026-18503?

CVE-2026-18503 is a known-severity vulnerability. It was published on August 10, 2026.

How severe is CVE-2026-18503?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-18503?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-18503?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-18503 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

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Continuous Pentesting

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Code Review

AI-driven PR review catches vulnerable dependencies before they ship.
HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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