Vulnerability-Lookup

CVE-2026-64617 (GCVE-0-2026-64617)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:07 – Updated: 2026-07-23 12:46

Title

Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW

Summary

Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in pubsub.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing. A "Shared" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.

Severity

3.8 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-732 - Incorrect Permission Assignment for Critical Resource
CWE-59 - Improper Link Resolution Before File Access

Assigner

CPANSec

References

2 references

URL	Tags
https://metacpan.org/release/EGOR/Data-PubSub-Sha…
https://metacpan.org/release/EGOR/Data-PubSub-Sha…	release-notes

Impacted products

1 product

Vendor	Product	Version
EGOR	Data::PubSub::Shared	Affected: 0 , < 0.07 (custom)

Show details on NVD website

JSON

To clipboard

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              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 3.8,
              "baseSeverity": "LOW",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "CHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
              "version": "3.1"
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                    "Technical Impact": "partial"
                  }
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              "description": "CWE-732 Incorrect Permission Assignment for Critical Resource",
              "lang": "en",
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            }
          ]
        },
        {
          "descriptions": [
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              "description": "CWE-59 Improper Link Resolution Before File Access",
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        }
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    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-64617",
    "datePublished": "2026-07-21T19:07:06.617Z",
    "dateReserved": "2026-07-20T11:30:10.287Z",
    "dateUpdated": "2026-07-23T12:46:23.202Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-07-23",
      "epss": "0.00161",
      "percentile": "0.05678"
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FKIE_CVE-2026-64617

Vulnerability from fkie_nvd - Published: 2026-07-21 20:17 - Updated: 2026-07-22 16:21

Severity

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/changes
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/diff/EGOR/Data-PubSub-Shared-0.06#pubsub.h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Data-PubSub-Shared",
          "product": "Data::PubSub::Shared",
          "programFiles": [
            "pubsub.h"
          ],
          "repo": "https://github.com/vividsnow/perl5-data-pubsub-shared",
          "vendor": "EGOR",
          "versions": [
            {
              "lessThan": "0.07",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.\n\nThe segment is created in pubsub.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing.\n\nA \"Shared\" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted file or symlink at the path lets a local attacker win a pre-creation race or redirect the open."
    }
  ],
  "id": "CVE-2026-64617",
  "lastModified": "2026-07-22T16:21:53.517",
  "metrics": {},
  "published": "2026-07-21T20:17:04.403",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/diff/EGOR/Data-PubSub-Shared-0.06#pubsub.h"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        },
        {
          "lang": "en",
          "value": "CWE-732"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-W3VW-Q5H9-GX9G

Vulnerability from github – Published: 2026-07-21 21:32 – Updated: 2026-07-21 21:32

Details

Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.

The segment is created in pubsub.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing.

A "Shared" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64617"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T20:17:04Z",
    "severity": null
  },
  "details": "Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.\n\nThe segment is created in pubsub.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing.\n\nA \"Shared\" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.",
  "id": "GHSA-w3vw-q5h9-gx9g",
  "modified": "2026-07-21T21:32:41Z",
  "published": "2026-07-21T21:32:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64617"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/changes"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/diff/EGOR/Data-PubSub-Shared-0.06#pubsub.h"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64617 (GCVE-0-2026-64617)

FKIE_CVE-2026-64617

GHSA-W3VW-Q5H9-GX9G

Tags

Sightings

Nomenclature