CVE-2026-18739

Popt-devel: popt-static: off-by-one in poptstuffargs

View on CVE.org

Published Aug 4, 2026 CVSS 3.1 · 2.5 Low EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

An off‑by‑one error in the poptStuffArgs function of the popt command‑line option parsing library can corrupt internal program data. If a host application then processes the altered data unsafely, a local attacker may be able to execute arbitrary code. The weakness is an out‑of‑bounds write (CWE‑787).

Affected Systems

The vulnerability affects any system that uses the popt library, particularly host applications that repeatedly call poptStuffArgs or employ deep alias nesting. No specific vendor or product version information is provided in the CVE data.

Risk and Exploitability

The CVSS score of 2.5 indicates low severity. The EPSS score is not available and the vulnerability is not listed in CISA KEV. Exploitation requires local access and depends on the host application processing the corrupted data unsafely. Overall risk is low to moderate, but local code execution is possible if the conditions are met.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

rpm-software-management

popt

unaffected

Version	Status	Constraints
`1.1.1`	affected	< *

Red Hat

Red Hat Hardened Images

affected

Version	Status	Constraints
`1.19-11.1.hum1`	unaffected	< *

Red Hat Red Hat Enterprise Linux 10 unknown —

Red Hat Red Hat Enterprise Linux 6 affected —

Red Hat Red Hat Enterprise Linux 7 affected —

Red Hat Red Hat Enterprise Linux 8 affected —

Red Hat Red Hat Enterprise Linux 9 unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

Red Hat Red Hat OpenShift Container Platform 5 affected —

No data.

No data.

Vendor Product Versions

Popt-devel

Popt-static

Version	Status	Scheme	Platform
`—`	affected	—	—

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

OpenCVE Recommended Actions

Update the popt library to a version that includes the fix for the poptStuffArgs off‑by‑one error.
Limit local access to the vulnerable application by ensuring it runs under a least‑privilege user account.
Analyze the application’s use of popt to prevent repeated calls or deep alias nesting, and sanitize argument input before processing.

Generated by OpenCVE AI on August 4, 2026 at 09:04 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.140% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://access.redhat.com/errata/RHSA-2026:56984
https://access.redhat.com/security/cve/CVE-2026-18739
https://bugzilla.redhat.com/show_bug.cgi?id=2510737
https://nvd.nist.gov/vuln/detail/CVE-2026-18739
https://www.cve.org/CVERecord?id=CVE-2026-18739

History

Nov 6, 2026 6:30 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat openshift Ai Redhat rhel Els
CPEs	cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9	cpe:/a:redhat:enterprise_linux:10 cpe:/a:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:openshift:5 cpe:/a:redhat:openshift_ai cpe:/o:redhat:rhel_els:6 cpe:/o:redhat:rhel_els:7
Vendors & Products		Redhat openshift Ai Redhat rhel Els

Aug 19, 2026 1:45 PM Added references View changes

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:56984

Aug 5, 2026 10:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Popt-devel Popt-devel popt-static
Vendors & Products		Popt-devel Popt-devel popt-static

Aug 4, 2026 11:30 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat openshift
CPEs		cpe:/a:redhat:openshift:4
Vendors & Products		Redhat openshift

Aug 4, 2026 11:00 PM Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
CPEs	~~cpe:/a:redhat:openshift:4~~
Vendors & Products	Redhat openshift

Aug 4, 2026 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Aug 4, 2026 5:45 AM Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Title	popt-devel: popt-static: Off-by-one in poptStuffArgs	Popt-devel: popt-static: off-by-one in poptstuffargs
First Time appeared		Redhat Redhat enterprise Linux Redhat hummingbird Redhat openshift
CPEs		cpe:/a:redhat:hummingbird:1 cpe:/a:redhat:openshift:4 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9
Vendors & Products		Redhat Redhat enterprise Linux Redhat hummingbird Redhat openshift
References		https://access.redhat.com/security/cve/CVE-2026-18739 https://bugzilla.redhat.com/show_bug.cgi?id=2510737

Aug 4, 2026 12:15 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		popt-devel: popt-static: Off-by-one in poptStuffArgs
Weaknesses		CWE-787
References		https://nvd.nist.gov/vuln/detail/CVE-2026-18739 https://www.cve.org/CVERecord?id=CVE-2026-18739
Metrics	threat_severity `None`	cvssV3_1 `{'score': 2.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'}` threat_severity `Low`

Earlier changes (3)

Subscriptions

Popt-devel Popt-static

Redhat Enterprise Linux Hummingbird Openshift Openshift Ai Rhel Els

Weaknesses

CWE-787
Out-of-bounds Write

Sources

CVE record Updated: Nov 6, 2026, 6:08 PM

Status: PUBLISHED
Assigner: redhat
Published: Aug 4, 2026, 5:32 AM
Updated: Nov 6, 2026, 6:08 PM
Reserved: Aug 3, 2026, 8:48 PM

View source JSON

Vulnrichment Updated: Aug 4, 2026, 1:44 PM

Updated: Aug 4, 2026, 1:44 PM

NVD Updated: Nov 6, 2026, 7:17 PM

Status: Awaiting Analysis
Published: Aug 4, 2026, 6:16 AM
Modified: Nov 6, 2026, 7:17 PM

View source JSON

Red Hat Updated: Aug 3, 2026, 6:46 PM

Severity: Low
Public date: Aug 3, 2026, 6:46 PM

View source Bugzilla JSON

OpenCVE enrichment Updated: Aug 5, 2026, 10:17 AM

Updated: Aug 5, 2026, 10:17 AM

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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."}], "id": "CVE-2026-18739", "lastModified": "2026-11-06T19:17:47.343", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 2.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18739", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-04T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-08-04T06:16:30.330", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:56984"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-18739"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510737"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"bugzilla": {"description": "popt-devel: popt-static: Off-by-one in poptStuffArgs", "id": "2510737", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510737"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-787", "details": ["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."], "name": "CVE-2026-18739", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "popt", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "popt", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "popt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "popt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "popt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "popt", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-03T18:46:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-18739\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-18739"], "statement": "This flaw has Low impact as it requires a host application to repeatedly call `poptStuffArgs` or use deep alias nesting, leading to an off-by-one error. Exploitation is only possible if the host application then unsafely processes the corrupted `poptContext` data, such as sinking it into `exec`, `system`, `popen`, or `dlopen`.", "threat_severity": "Low"}