Vulnerability-Lookup

CVE-2026-64613 (GCVE-0-2026-64613)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:05 – Updated: 2026-07-23 12:25

Title

Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW

Summary

Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW. The segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached. 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 symlink at the path redirects the open to another file.

Severity

6.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-23 12:24 UTC

CWE

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

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 342 records in the last 180 days details

References

2 references

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

Impacted products

1 product

Vendor	Product	Version	CPE status
EGOR	Data::Buffer::Shared	Affected: 0 , < 0.05 (custom)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.2,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
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                "id": "CVE-2026-64613",
                "options": [
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                  },
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              "type": "CWE"
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          ]
        },
        {
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        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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        },
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          "tags": [
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          "url": "https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes"
        }
      ],
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          "lang": "en",
          "value": "Upgrade to Data::Buffer::Shared 0.05 or later, which creates the backing file mode 0600 (owner-only) with O_NOFOLLOW."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW",
      "workarounds": [
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          "value": "For deployments that cannot upgrade to 0.05, set a restrictive umask so the backing file is not world-readable and place it in a directory only the owning user can access."
        }
      ],
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    "dateReserved": "2026-07-20T11:30:10.287Z",
    "dateUpdated": "2026-07-23T12:25:36.375Z",
    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-64613",
        "lastModified": "2026-10-24T19:10:00.127",
        "metrics": {
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                "confidentialityImpact": "HIGH",
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}

FKIE_CVE-2026-64613

Vulnerability from fkie_nvd - Published: 2026-07-21 20:17 - Updated: 2026-10-24 19:10

Severity

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

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Data-Buffer-Shared",
          "product": "Data::Buffer::Shared",
          "programFiles": [
            "buf_generic.h"
          ],
          "repo": "https://github.com/vividsnow/perl5-data-buffer-shared",
          "vendor": "EGOR",
          "versions": [
            {
              "lessThan": "0.05",
              "status": "affected",
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              "versionType": "custom"
            }
          ]
        }
      ],
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    }
  ],
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    {
      "lang": "en",
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    },
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      "value": "Las versiones de Data::Buffer::Shared anteriores a la 0.05 para Perl crean un archivo de respaldo mmap legible por cualquier usuario y lo abren sin O_NOFOLLOW.\n\nEl segmento se crea en buf_generic.h con open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL bloquea un archivo preexistente al crearlo, pero el modo es 0666, as\u00ed que bajo la umask predeterminada 022 el archivo se crea con el modo 0644 (legible por cualquier usuario), y O_NOFOLLOW est\u00e1 ausente, por lo que un enlace simb\u00f3lico colocado en la ruta es seguido cuando el segmento se adjunta.\n\nUn segmento \u2019Shared\u2019 reside naturalmente en un directorio compartido como /tmp o /dev/shm, donde cualquier usuario local puede leer las cargas \u00fatiles IPC almacenadas en el segmento legible por cualquier usuario, y un enlace simb\u00f3lico preestablecido en la ruta redirige la apertura a otro archivo."
    }
  ],
  "id": "CVE-2026-64613",
  "lastModified": "2026-10-24T19:10:00.127",
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}

GHSA-PMMG-WC48-VJHQ

Vulnerability from github – Published: 2026-07-21 21:32 – Updated: 2026-07-23 15:30

Details

Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW.

The segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached.

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 symlink at the path redirects the open to another file.

Severity

6.2 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64613"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T20:17:03Z",
    "severity": "MODERATE"
  },
  "details": "Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW.\n\nThe segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached.\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 symlink at the path redirects the open to another file.",
  "id": "GHSA-pmmg-wc48-vjhq",
  "modified": "2026-07-23T15:30:35Z",
  "published": "2026-07-21T21:32:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64613"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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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

CVE-2026-64613 (GCVE-0-2026-64613)

FKIE_CVE-2026-64613

GHSA-PMMG-WC48-VJHQ

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Related by attack behaviour