Vulnerability-Lookup

CVE-2026-18938 (GCVE-0-2026-18938)

Vulnerability from cvelistv5 – Published: 2026-08-07 08:19 – Updated: 2026-08-07 15:14

Title

P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nested attribute storage on 32 bit systems

Summary

A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.

Severity

6.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 15:14 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

redhat

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-18938	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2478995	issue-trackingx_refsource_REDHAT

Impacted products

7 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

2026-08-07 08:13

Credits

This issue was discovered by Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-18938

Vulnerability from fkie_nvd - Published: 2026-08-07 09:16 - Updated: 2026-08-14 19:07

Severity

6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-18938
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2478995

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-07T15:14:33.972824Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-07T09:16:58.670",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18938"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2478995"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6X8P-H5FJ-5PPR

Vulnerability from github – Published: 2026-08-07 09:31 – Updated: 2026-08-07 09:31

Details

Severity

6.2 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18938"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-07T09:16:58Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.",
  "id": "GHSA-6x8p-h5fj-5ppr",
  "modified": "2026-08-07T09:31:53Z",
  "published": "2026-08-07T09:31:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18938"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18938"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2478995"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-18938

Vulnerability from osv_ubuntu

Published

2026-08-07 09:16

Modified

2026-08-13 00:02

Summary

Details

Severity

6.2 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-18938	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-18938	REPORT
	https://github.com/p11-glue/p11-kit/pull/777	REPORT
	https://access.redhat.com/security/cve/CVE-2026-18938	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2478995	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.20.2-2ubuntu2+esm1"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.20.2-2ubuntu2+esm1"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.20.2-2ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.20.2-2ubuntu2+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18.3-2ubuntu1",
        "0.20.1-2ubuntu1",
        "0.20.2-1ubuntu1",
        "0.20.2-1ubuntu2",
        "0.20.2-2ubuntu1",
        "0.20.2-2ubuntu2",
        "0.20.2-2ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.23.2-5~ubuntu16.04.2"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.23.2-5~ubuntu16.04.2"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.23.2-5~ubuntu16.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.23.2-5~ubuntu16.04.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.23.1-3",
        "0.23.2-2",
        "0.23.2-3",
        "0.23.2-5~ubuntu16.04.1",
        "0.23.2-5~ubuntu16.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.23.9-2ubuntu0.1"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.23.9-2ubuntu0.1"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.23.9-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.23.9-2ubuntu0.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.23.7-3",
        "0.23.9-2",
        "0.23.9-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.23.20-1ubuntu0.1"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.23.20-1ubuntu0.1"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.23.20-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.23.20-1ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.23.17-2",
        "0.23.18.1-2",
        "0.23.19-2",
        "0.23.20-1",
        "0.23.20-1build1",
        "0.23.20-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.24.0-6build1"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.24.0-6build1"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.24.0-6build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.24.0-6build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.23.22-1build1",
        "0.24.0-5",
        "0.24.0-6",
        "0.24.0-6build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.25.3-4ubuntu2.1"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.25.3-4ubuntu2.1"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.25.3-4ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.25.3-4ubuntu2.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.0-4ubuntu1",
        "0.25.3-2ubuntu2",
        "0.25.3-4ubuntu1",
        "0.25.3-4ubuntu2",
        "0.25.3-4ubuntu2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libp11-kit0",
            "binary_version": "0.26.2-2"
          },
          {
            "binary_name": "p11-kit",
            "binary_version": "0.26.2-2"
          },
          {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.26.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "p11-kit",
        "purl": "pkg:deb/ubuntu/p11-kit@0.26.2-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.5-3ubuntu1",
        "0.25.9-2",
        "0.25.10-1",
        "0.25.10-1ubuntu1",
        "0.26.2-2"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.",
  "id": "UBUNTU-CVE-2026-18938",
  "modified": "2026-08-13T00:02:19Z",
  "published": "2026-08-07T09:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-18938"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18938"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/p11-glue/p11-kit/pull/777"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18938"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2478995"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-18938"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-18938 (GCVE-0-2026-18938)

FKIE_CVE-2026-18938

GHSA-6X8P-H5FJ-5PPR

ubuntu-cve-2026-18938

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature