FKIE_CVE-2026-4426

Vulnerability from fkie_nvd - Published: 2026-03-19 15:16 - Updated: 2026-05-03 21:16
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:8944
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-4426Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2449010Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://github.com/libarchive/libarchive/pull/2897Issue Tracking, Patch
Impacted products
Vendor Product Version
libarchive libarchive -
redhat hardened_images -
redhat openshift_container_platform 4.0
redhat enterprise_linux 6.0
redhat enterprise_linux 7.0
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
redhat enterprise_linux 10.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 un defecto en libarchive. Existe una vulnerabilidad de comportamiento indefinido en la l\u00f3gica de descompresi\u00f3n de zisofs, causada por una validaci\u00f3n incorrecta de un campo (\u0027pz_log2_bs\u0027) le\u00eddo de las extensiones Rock Ridge de ISO9660. Un atacante remoto puede explotar esto al proporcionar un archivo ISO especialmente dise\u00f1ado. Esto puede llevar a una asignaci\u00f3n de memoria incorrecta y posibles ca\u00eddas de la aplicaci\u00f3n, lo que resulta en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."
    }
  ],
  "id": "CVE-2026-4426",
  "lastModified": "2026-05-03T21:16:11.863",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
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  "published": "2026-03-19T15:16:28.510",
  "references": [
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      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:8944"
    },
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      "tags": [
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      "tags": [
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  "vulnStatus": "Modified",
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          "value": "CWE-1335"
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      "source": "secalert@redhat.com",
      "type": "Secondary"
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}


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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

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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.



Detection rules are retrieved from Rulezet.