Vulnerability-Lookup

CVE-2026-42011 (GCVE-0-2026-42011)

Vulnerability from cvelistv5 – Published: 2026-05-07 13:51 – Updated: 2026-05-07 14:55

Title

Gnutls: gnutls: security bypass due to incorrect name constraint handling

Summary

A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.

Severity ?

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-295 - Improper Certificate Validation

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/security/cve/CVE-2026-42011	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2467437	issue-trackingx_refsource_REDHAT

Impacted products

Vendor

Product

Version

Red Hat

Red Hat Enterprise Linux 10

cpe:/o:redhat:enterprise_linux:10

Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public ?

2026-04-29 00:00

Credits

Red Hat would like to thank Haruto Kimura (Stella) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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WID-SEC-W-2026-1312

Vulnerability from csaf_certbund - Published: 2026-04-29 22:00 - Updated: 2026-05-04 22:00

Summary

GnuTLS: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: GnuTLS (GNU Transport Layer Security Library) ist eine im Quelltext frei verfügbare Bibliothek, die Secure Sockets Layer (SSL) und Transport Layer Security (TLS) implementiert.

Angriff: Ein Angreifer kann mehrere Schwachstellen in GnuTLS ausnutzen, um Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

Betroffene Betriebssysteme: - Sonstiges - UNIX - Windows

CVE-2026-33845

CVE-2026-33846

CVE-2026-3832

CVE-2026-3833

CVE-2026-42009

CVE-2026-42010

CVE-2026-42011

CVE-2026-42012

CVE-2026-42013

CVE-2026-42014

CVE-2026-42015

CVE-2026-5260

CVE-2026-5419

References

URL

Category

	https://wid.cert-bund.de/.well-known/csaf/white/2…	self
	https://wid.cert-bund.de/portal/wid/securityadvis…	self
	https://gnutls.org/security-new.html	external
	https://seclists.org/oss-sec/2026/q2/288	external
	https://access.redhat.com/errata/RHSA-2026:13274	external

JSON

To clipboard

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      "text": "hoch"
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    "csaf_version": "2.0",
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        "url": "https://www.first.org/tlp/"
      }
    },
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        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
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        "title": "Angriff"
      },
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      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
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        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42009"
    },
    {
      "cve": "CVE-2026-42010",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42010"
    },
    {
      "cve": "CVE-2026-42011",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42011"
    },
    {
      "cve": "CVE-2026-42012",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42012"
    },
    {
      "cve": "CVE-2026-42013",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42013"
    },
    {
      "cve": "CVE-2026-42014",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42014"
    },
    {
      "cve": "CVE-2026-42015",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-42015"
    },
    {
      "cve": "CVE-2026-5260",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-5260"
    },
    {
      "cve": "CVE-2026-5419",
      "product_status": {
        "known_affected": [
          "67646",
          "T053415"
        ]
      },
      "release_date": "2026-04-29T22:00:00.000+00:00",
      "title": "CVE-2026-5419"
    }
  ]
}

FKIE_CVE-2026-42011

Vulnerability from fkie_nvd - Published: 2026-05-07 15:16 - Updated: 2026-05-07 15:48

Severity ?

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-42011
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2467437

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems."
    }
  ],
  "id": "CVE-2026-42011",
  "lastModified": "2026-05-07T15:48:55.550",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2,
        "source": "secalert@redhat.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-07T15:16:09.760",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42011"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Primary"
    }
  ]
}

GHSA-568W-37QX-3QC6

Vulnerability from github – Published: 2026-05-07 15:38 – Updated: 2026-05-07 15:38

Details

Severity ?

7.4 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-42011"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-07T15:16:09Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.",
  "id": "GHSA-568w-37qx-3qc6",
  "modified": "2026-05-07T15:38:42Z",
  "published": "2026-05-07T15:38:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42011"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Action not permitted

CVE-2026-42011 (GCVE-0-2026-42011)

WID-SEC-W-2026-1312

FKIE_CVE-2026-42011

GHSA-568W-37QX-3QC6

Tags

Sightings

Nomenclature