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Δ / VULNERABILITY RECORD

CVE-2026-18839.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSLOW / 2.2No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Sep 24, 2026

Disclosure summary

Popt-devel: popt-static: size_t underflow in singleoptionhelp

Source-reported weakness categories

CWE-191

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Aug

Open original source · Updated Sep 24, 2026

Popt-devel: popt-static: size_t underflow in singleoptionhelp

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 2.2

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 rsync 3.4.3-1 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 rsync 3.5.0-1 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 popt 1.19-1 on Azure Linux 3.0 (MSRC status code 3)

Vendor remediation references

  • Release Notes · product IDs 21845-17084, 21663-17084
  • Vendor guidance · product IDs 21845-17084, 21663-17084

Original records & references

PUBLISHED 2026-08-06T21:09:30-04:00
MODIFIED 2026-09-24T22:33:59-04:00
INGESTED 2026-10-08T12:35:08-04:00