Vulnerability-Lookup

OESA-2026-3503 (CVE-2026-18938)

Vulnerability from osv_openeuler – Published: 2026-08-30 04:14 – Updated: 2026-08-30 04:14 – Source website

Summary

p11-kit security update

Details

Provides a way to load and enumerate PKCS#11 modules. Provides a standard configuration setup for installing PKCS#11 modules in such a way that they're discoverable. Also solves problems with coordinating the use of PKCS#11 by different components or libraries living in the same process.

Security Fix(es):

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.(CVE-2026-18938)

Severity

6.2 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-18938	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "p11-kit-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp3.aarch64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp3.aarch64.rpm"
        ],
        "src": [
          "p11-kit-0.25.0-3.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "p11-kit-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp3.x86_64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "p11-kit",
        "purl": "pkg:rpm/openEuler/p11-kit\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.0-3.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "p11-kit-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp4.aarch64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp4.aarch64.rpm"
        ],
        "src": [
          "p11-kit-0.25.0-3.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "p11-kit-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp4.x86_64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "p11-kit",
        "purl": "pkg:rpm/openEuler/p11-kit\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.0-3.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "p11-kit-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-debuginfo-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-debugsource-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-devel-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-help-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-server-0.23.20-6.oe2003sp4.aarch64.rpm",
          "p11-kit-trust-0.23.20-6.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "p11-kit-0.23.20-6.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "p11-kit-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-debuginfo-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-debugsource-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-devel-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-help-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-server-0.23.20-6.oe2003sp4.x86_64.rpm",
          "p11-kit-trust-0.23.20-6.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "p11-kit",
        "purl": "pkg:rpm/openEuler/p11-kit\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.20-6.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "p11-kit-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-debuginfo-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-debugsource-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-devel-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-help-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-server-0.24.0-3.oe2203sp4.aarch64.rpm",
          "p11-kit-trust-0.24.0-3.oe2203sp4.aarch64.rpm"
        ],
        "src": [
          "p11-kit-0.24.0-3.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "p11-kit-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-debuginfo-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-debugsource-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-devel-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-help-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-server-0.24.0-3.oe2203sp4.x86_64.rpm",
          "p11-kit-trust-0.24.0-3.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "p11-kit",
        "purl": "pkg:rpm/openEuler/p11-kit\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0-3.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "p11-kit-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp1.aarch64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp1.aarch64.rpm"
        ],
        "src": [
          "p11-kit-0.25.0-3.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "p11-kit-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-debuginfo-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-debugsource-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-devel-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-help-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-server-0.25.0-3.oe2403sp1.x86_64.rpm",
          "p11-kit-trust-0.25.0-3.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "p11-kit",
        "purl": "pkg:rpm/openEuler/p11-kit\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.0-3.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Provides a way to load and enumerate PKCS#11 modules. Provides a standard configuration setup for installing PKCS#11 modules in such a way that they\u0026amp;apos;re discoverable. Also solves problems with coordinating the use of PKCS#11 by different components or libraries living in the same process.\r\n\r\nSecurity Fix(es):\n\nA 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.(CVE-2026-18938)",
  "id": "OESA-2026-3503",
  "modified": "2026-08-30T04:14:19Z",
  "published": "2026-08-30T04:14:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3503"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18938"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "p11-kit security update",
  "upstream": [
    "CVE-2026-18938"
  ]
}

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

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 redhat root

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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                "role": "CISA Coordinator",
                "timestamp": "2026-08-07T15:14:33.972824Z",
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          "cpes": [
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    "dateReserved": "2026-08-05T12:44:08.706Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-3503 (CVE-2026-18938)

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

Tags

Sightings

Nomenclature

Related by attack behaviour