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FKIE_CVE-2026-42784

Vulnerability from fkie_nvd - Published: 2026-09-16 17:17 - Updated: 2026-09-16 19:42
Severity
7.4 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Summary
A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-42784
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2464122
Impacted products
Vendor Product Version
To clipboard 

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  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity."
    }
  ],
  "id": "CVE-2026-42784",
  "lastModified": "2026-09-16T19:42:43.623",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
          "version": "3.1"
        },
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        "impactScore": 4.0,
        "source": "secalert@redhat.com",
        "type": "Primary"
      }
    ]
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  "published": "2026-09-16T17:17:18.380",
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      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42784"
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464122"
    }
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  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Primary"
    }
  ]
}



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