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CVE-2026-18839

Full vulnerability record from the local CVENow database.

Description

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

Severity
LOW
CVSS score
2.2 (v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
[email protected]
Published
2026-08-05 21:16:57.727000
Last modified
2026-11-06 19:17:47.863000
View original CVE JSON 
{
  "id": "CVE-2026-18839",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-05T21:16:57.727",
  "lastModified": "2026-11-06T19:17:47.863",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
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          "packageName": "popt",
          "versions": [
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              "lessThan": "*",
              "versionType": "semver",
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            }
          ]
        },
        {
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          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "packageName": "popt-main",
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
          ],
          "versions": [
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            }
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  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L",
          "baseScore": 2.2,
          "baseSeverity": "LOW",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-06T13:33:56.244752Z",
          "id": "CVE-2026-18839",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:77932",
      "source": "[email protected]"
    },
    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-18839",
      "source": "[email protected]"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511010",
      "source": "[email protected]"
    }
  ]
}