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CVE record · CVE-2026-18503

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

CVSS 2.4 LowEPSS 0.0012 · 1st percentile

Published by the CVE Program (CNA: PSF) at 10 Aug 2026, 13:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Python Software Foundation CPython
  • affected before 3.10.21 python
  • affected 3.11.0 to before 3.11.16 python
  • affected 3.12.0 to before 3.12.14 python
  • affected 3.13.0 to before 3.13.15 python
  • affected 3.14.0 to before 3.14.7 python
  • affected 3.15.0a1 to before 3.15.0rc1 python
  • affected 3.16.0a1 to before 3.16.0 python
Other versions: unaffected
Identifiers
CVE-2026-18503
CNA
PSF
Weakness (CWE)
CWE-1176
Tags
Published
10 Aug 2026
Updated
14 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.4 Low 4.0 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 CNA (PSF)
  • CISA KEV Not listed.
  • EPSS 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 10 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.