CVE-2026-18743: Popt-devel: popt-static: short realloc in poptconfigfiletostring

lowCVSS 2.5CVE-2026-18743

CSIRTS triage

vendor: popt product: popt Memory corruption

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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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 2.5
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18743

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-187430.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-18743	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

lowCVE-2026-18743: A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted c…nvd

Recent advisories for Popt-devel

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

lowCVE-2026-18739: Popt-devel: popt-static: off-by-one in poptstuffargsmsrc · 2026-08-11
lowCVE-2026-18839: Popt-devel: popt-static: size_t underflow in singleoptionhelpmsrc · 2026-08-11