CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-18839: Popt-devel: popt-static: size_t underflow in singleoptionhelp

lowCVSS 2.2CVE-2026-18839

CSIRTS triage

vendor: Poptproduct: PoptMemory corruption
What
A size_t underflow in singleoptionhelp causes a memory corruption defect.
Who is affected
Users of popt-devel and popt-static libraries.
Urgency
Low severity with CVSS 2.2; no active exploitation reported.
Action
Update to a patched version of popt when available.

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

⚡ Watch Popt

Get an email when a new Popt advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 2.2
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18839

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-18839coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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.

More from Microsoft Security Response Center