Vulnerabilities

CVSS

2.4 Low

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

Risk score

19.2

Published

2026-08-10

Status

Published

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().

Weaknesses

CWE-1176

Coverage 1

vulnerability

Vulnérabilité dans CPython (11 août 2026)

A denial-of-service vulnerability has been identified in CPython, allowing an attacker to disrupt remote systems. The vulnerability stems from a lack of recent security updates and requires immediate patching to prevent…

CERT-FR · Aug 11, 2026 Medium

CVE-2026-18503pythondenial-of-servicevulnerability

All articles mentioning it

Advisories and references

• mail.python.org/archives/list/[email protected]/thread/KQ...
• github.com/python/cpython/pull/153694
• github.com/python/cpython/issues/98820
• github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f...
• github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697...
• github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa...
• github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777f...
• github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a745...
• github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d8...