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Microsoft Security Response CenterCVE-2026-18503

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

Mariner

Read the vendor bulletin Get alerts for azl3 python3 3.12.9-14 on Azure Linux
LowCVSS not listedLow severity
Scope

What the vendor says is affected

  • azl3 python3 3.12.9-14 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 3.12.14-1
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Removed affected products: azl3 tensorflow 2.16.1-11 on Azure Linux 3.0.
    • Added fixed versions: 3.12.14-1.
    • The vendor changed its remediation guidance.
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-18503View CVSS, KEV, EPSS, and threat context
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