RHSA-2026:56984

Vulnerability from csaf_redhat - Published: 2026-08-19 13:11 - Updated: 2026-11-07 05:51
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-0:1.19-11.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@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 7 products, the same list as for CVE-2026-18739
Threats
Impact Low
References
Acknowledgments
Checkpoint Matanya Moses
To clipboard 

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      "cve": "CVE-2026-18739",
      "cwe": {
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        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2026-08-03T17:40:02.416000+00:00",
      "ids": [
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          "category": "description",
          "text": "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": "Vulnerability description"
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          "text": "popt-devel: popt-static: Off-by-one in poptStuffArgs",
          "title": "Vulnerability summary"
        },
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          "category": "other",
          "text": "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`.",
          "title": "Statement"
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
          "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
          "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
          "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
          "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18739",
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      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-08-19T13:11:20+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
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        },
        {
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          "details": "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.",
          "product_ids": [
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            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
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            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
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      "scores": [
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            "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"
          },
          "products": [
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            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "popt-devel: popt-static: Off-by-one in poptStuffArgs"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Matanya Moses"
          ],
          "organization": "Checkpoint"
        }
      ],
      "cve": "CVE-2026-18743",
      "cwe": {
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        "name": "Incorrect Calculation of Buffer Size"
      },
      "discovery_date": "2026-08-03T20:11:07.778000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2510809"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "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"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@aarch64",
          "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src",
          "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
          "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
          "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
          "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
          "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18743"
        },
        {
          "category": "external",
          "summary": "RHBZ#2510809",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510809"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18743",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18743"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18743",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18743"
        }
      ],
      "release_date": "2026-08-03T21:13:10.935000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-19T13:11:20+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:56984"
        },
        {
          "category": "workaround",
          "details": "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.",
          "product_ids": [
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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"
          },
          "products": [
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@src",
            "Red Hat Hardened Images:popt-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-devel-0:1.19-11.1.hum1@x86_64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@aarch64",
            "Red Hat Hardened Images:popt-static-0:1.19-11.1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "popt-devel: popt-static: Short realloc in poptConfigFileToString"
    }
  ]
}



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Sightings

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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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