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CVE-2026-18739: Popt-devel: popt-static: off-by-one in poptstuffargs

lowCVSS 2.5CVE-2026-18739

CSIRTS triage

vendor: Poptproduct: PoptCode injection
What
poptstuffargs function contains an off-by-one error in buffer handling.
Who is affected
Applications linked against vulnerable Popt library versions.
Urgency
Low; off-by-one errors may enable local exploitation under specific conditions.
Action
Update to a patched Popt version that corrects the off-by-one buffer logic.

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
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18739

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-2026-18739coverage & 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.

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