CVE catalog

CVE-2026-18938

A flaw was found in p11-kit. A local attacker, or one…

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: Medium · CVSS 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jun 29, 2026, 7:16:40 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.11% · Oct 27, 2026

Projects and upstream resources

[p11-kit][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiansid	p11-kit	`0.26.5-1`	FixedDistribution-reported fixed boundary	[CVE-2026-18938]
Debianforky	p11-kit	`0.26.5-1`	FixedDistribution-reported fixed boundary	[CVE-2026-18938]

Showing 2 fix observations. All 34 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	p11-kit	Not reported	AffectedDistribution reports no fix	[CVE-2026-18938]
Debianbookworm	p11-kit	`0.24.1-2`	Affected	[CVE-2026-18938]
Debianforky	p11-kit	`0.26.5-1`	FixedDistribution-reported fixed boundary	[CVE-2026-18938]
Debiansid	p11-kit	`0.26.5-1`	FixedDistribution-reported fixed boundary	[CVE-2026-18938]
Debiantrixie	p11-kit	Not reported	AffectedDistribution reports no fix	[CVE-2026-18938]
Debiantrixie	p11-kit	`0.25.5-3`	Affected	[CVE-2026-18938]
Ubuntu22.04	p11-kit	`0.23.22-1build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu22.04	p11-kit	`0.24.0-5`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu22.04	p11-kit	`0.24.0-6`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu22.04	p11-kit	`0.24.0-6build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu22.04	p11-kit	`0.24.0-6ubuntu0.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.0-4ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.3-2ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.3-4ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.3-4ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.3-4ubuntu2.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu24.04	p11-kit	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu26.04	p11-kit	`0.25.10-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu26.04	p11-kit	`0.25.10-1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu26.04	p11-kit	`0.25.5-3ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu26.04	p11-kit	`0.25.9-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntu26.04	p11-kit	`0.26.2-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntunoble	libp11-kit-dev	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	Provider not reported
Ubuntunoble	libp11-kit0	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	Provider not reported
Ubuntunoble	p11-kit	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	Provider not reported
Ubuntunoble	p11-kit-doc	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	Provider not reported
Ubuntunoble	p11-kit-modules	`0.25.3-4ubuntu2.2`	UnknownSource applicability is not established	Provider not reported
Ubuntupro	p11-kit	`0.23.17-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.18.1-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.19-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.20-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.20-1build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.20-1ubuntu0.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC
Ubuntupro	p11-kit	`0.23.20-1ubuntu0.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2026-18938]Aug 31, 2026, 5:15:59 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "p11-kit",
      "status": "fixed",
      "release": "sid",
      "version": "0.26.5-1"
    },
    {
      "name": "p11-kit",
      "status": "fixed",
      "release": "forky",
      "version": "0.26.5-1"
    },
    {
      "name": "p11-kit",
      "status": "vulnerable",
      "release": "trixie",
      "version": "0.25.5-3"
    },
    {
      "name": "p11-kit",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "0.24.1-2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1144476,
      "name": "p11-kit",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "0.26.5-1"
    },
    {
      "bug": 1144476,
      "name": "p11-kit",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "0.26.5-1"
    },
    {
      "bug": 1144476,
      "name": "p11-kit",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1144476,
      "name": "p11-kit",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "p11-kit",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "0.25.3-4ubuntu2.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "applicability_unknown": true
    },
    {
      "name": "libp11-kit-dev",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "0.25.3-4ubuntu2.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "applicability_unknown": true
    },
    {
      "name": "libp11-kit0",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "0.25.3-4ubuntu2.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit-doc",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "0.25.3-4ubuntu2.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit-modules",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "0.25.3-4ubuntu2.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.20-1ubuntu0.1+esm1"
            }
          ]
        }
      ],
      "release": "pro",
      "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": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18938",
      "fixed_version": "0.23.20-1ubuntu0.1+esm1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2026-18938",
      "provider_updated_at": "2026-08-31T17:15:59.961552552Z",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0-6ubuntu0.1"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "0.23.22-1build1",
        "0.24.0-5",
        "0.24.0-6",
        "0.24.0-6build1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18938",
      "fixed_version": "0.24.0-6ubuntu0.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2026-18938",
      "provider_updated_at": "2026-08-31T17:15:59.961552552Z",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.3-4ubuntu2.2"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "0.25.0-4ubuntu1",
        "0.25.3-2ubuntu2",
        "0.25.3-4ubuntu1",
        "0.25.3-4ubuntu2",
        "0.25.3-4ubuntu2.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18938",
      "fixed_version": "0.25.3-4ubuntu2.2",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2026-18938",
      "provider_updated_at": "2026-08-31T17:15:59.961552552Z",
      "applicability_unknown": true
    },
    {
      "name": "p11-kit",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "0.25.5-3ubuntu1",
        "0.25.9-2",
        "0.25.10-1",
        "0.25.10-1ubuntu1",
        "0.26.2-2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18938",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2026-18938",
      "provider_updated_at": "2026-08-31T17:15:59.961552552Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #1144476]

Publisher notes

[trixie] p11-kit: Minor issue [bookworm] p11-kit: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libp11-kit0]Unknown
Source package: [p11-kit]
Details (2)
- 0.24.1-2 · amd64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
- 0.24.1-2 · arm64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
[libp11-kit-dev]Unknown
Source package: [p11-kit]
Details (2)
- 0.24.1-2 · amd64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
- 0.24.1-2 · arm64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
[p11-kit]Unknown
Details (2)
- 0.24.1-2 · amd64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
- 0.24.1-2 · arm64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
[p11-kit-doc]Unknown
Source package: [p11-kit]
Details (2)
- 0.24.1-2 · all · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
- 0.24.1-2 · all · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
[p11-kit-modules]Unknown
Source package: [p11-kit]
Details (2)
- 0.24.1-2 · amd64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12
- 0.24.1-2 · arm64 · bookworm
  Affected
  nvd · p11-kit · debian · bookworm; nvd · p11-kit · debian · 12

[Debian 13 (Trixie)]

[libp11-kit0]Unknown
Source package: [p11-kit]
Details (2)
- 0.25.5-3 · amd64 · trixie
  Affected
  nvd · p11-kit · debian · 13
- 0.25.5-3 · arm64 · trixie
  Affected
  nvd · p11-kit · debian · 13
[libp11-kit-dev]Unknown
Source package: [p11-kit]
Details (2)
- 0.25.5-3 · amd64 · trixie
  Affected
  nvd · p11-kit · debian · 13
- 0.25.5-3 · arm64 · trixie
  Affected
  nvd · p11-kit · debian · 13
[p11-kit]Unknown
Details (2)
- 0.25.5-3 · amd64 · trixie
  Affected
  nvd · p11-kit · debian · 13
- 0.25.5-3 · arm64 · trixie
  Affected
  nvd · p11-kit · debian · 13
[p11-kit-doc]Unknown
Source package: [p11-kit]
Details (2)
- 0.25.5-3 · all · trixie
  Affected
  nvd · p11-kit · debian · 13
- 0.25.5-3 · all · trixie
  Affected
  nvd · p11-kit · debian · 13
[p11-kit-modules]Unknown
Source package: [p11-kit]
Details (2)
- 0.25.5-3 · amd64 · trixie
  Affected
  nvd · p11-kit · debian · 13
- 0.25.5-3 · arm64 · trixie
  Affected
  nvd · p11-kit · debian · 13

Observed: Oct 23, 2026, 9:45:20 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]