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RHSA-2026:56984

Vulnerability from csaf_redhat - Published: 2026-08-19 13:11 - Updated: 2026-09-07 03:32
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Low
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: popt: * popt-1.19-11.1.hum1 (aarch64, x86_64) * popt-devel-1.19-11.1.hum1 (aarch64, x86_64) * popt-static-1.19-11.1.hum1 (aarch64, x86_64) * popt-1.19-11.1.hum1.src (src) Security Fix(es): popt: * CVE-2026-18739 * CVE-2026-18743
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-18739

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.

2.5 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:popt-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Low
CVE-2026-18743

A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the `poptConfigFileToString` function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).

2.5 (Low)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE-131 - Incorrect Calculation of Buffer Size
Affected products
Fixed 3 products, the same list as for CVE-2026-18739
Threats
Impact Low
References
Acknowledgments
Checkpoint Matanya Moses
To clipboard 

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          "title": "Vulnerability description"
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          "text": "popt-devel: popt-static: Short realloc in poptConfigFileToString",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Low impact heap overflow in `popt` occurs when processing specially crafted configuration files through an explicit call to `poptConfigFileToString()`. Red Hat products are less exposed as this function is not utilized by internal sources, limiting the attack surface to scenarios where untrusted `popt` configuration content is explicitly loaded.",
          "title": "Statement"
        },
        {
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          "title": "CVSS score applicability"
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            "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",
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          },
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            "Red Hat Hardened Images:popt-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "popt-devel: popt-static: Short realloc in poptConfigFileToString"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.