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Vulnerability · Published Aug 4, 2026 · Assigned by redhat

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

Low 2.5

In plain English

A low-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)2.5Low
Exploit odds (30 days)0.1%top 96.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12poptno fix listedDEBIAN-CVE-2026-18739
Debian:13poptno fix listedDEBIAN-CVE-2026-18739
Debian:14poptno fix listedDEBIAN-CVE-2026-18739
Ubuntu:22.04:LTSpoptno fix listedUBUNTU-CVE-2026-18739
Ubuntu:24.04:LTSpoptno fix listedUBUNTU-CVE-2026-18739
Ubuntu:26.04:LTSpoptno fix listedUBUNTU-CVE-2026-18739
Ubuntu:26.10poptno fix listedUBUNTU-CVE-2026-18739

Affected products (as reported)

VendorProductVersions
rpm-software-management popt 1.1.1 – before *
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

References