CVE-2026-18743

lowCVSS 2.5covered by 2 sourcesfirst seen 2026-09-01

A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the poptConfigFileToString function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).

CSIRTS triage

What: Short realloc buffer issue in poptconfigfiletostring function.
Who is affected: Systems using popt-devel or popt-static libraries in affected versions.
Urgency: Low severity (CVSS 2.5); remediation can follow standard patching cycle.
Action: Update popt to the patched version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Advisory coverage (2)

lowCVE-2026-18743: Popt-devel: popt-static: short realloc in poptconfigfiletostringmsrc · 2026-09-02
lowCVE-2026-18743: A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted c…nvd · 2026-09-01

External references

NVD record for CVE-2026-18743

CVE.org record

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