Vulnerability-Lookup

CVE-2026-40556 (GCVE-0-2026-40556)

Vulnerability from cvelistv5 – Published: 2026-04-28 13:54 – Updated: 2026-04-29 07:17

This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

Replaced by CVE-2026-6842

Show details on NVD website

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FKIE_CVE-2026-40556

Vulnerability from fkie_nvd - Published: 2026-04-28 15:16 - Updated: 2026-04-29 08:16

Severity ?

Summary

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

References

	URL	Tags

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "id": "CVE-2026-40556",
  "lastModified": "2026-04-29T08:16:17.750",
  "metrics": {},
  "published": "2026-04-28T15:16:30.150",
  "references": [],
  "sourceIdentifier": "cvd@cert.pl",
  "vulnStatus": "Rejected"
}

MSRC_CVE-2026-40556

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-29 01:07

Summary

Insecure Directory Permissions in GNU nano Leading to Privilege Abuse

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-40556

CWE-732 - Incorrect Permission Assignment for Critical Resource

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
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        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
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        "summary": "CVE-2026-40556 Insecure Directory Permissions in GNU nano Leading to Privilege Abuse - VEX",
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      },
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Insecure Directory Permissions in GNU nano Leading to Privilege Abuse",
    "tracking": {
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      "generator": {
        "date": "2026-04-29T07:32:41.759Z",
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      "title": "Insecure Directory Permissions in GNU nano Leading to Privilege Abuse"
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}

GHSA-9G7J-RCQF-CPCX

Vulnerability from github – Published: 2026-04-28 15:30 – Updated: 2026-04-29 09:30

Details

GNU nano creates the user’s ~/.local directory with overly permissive permissions when the directory does not exist yet. On first use of features requiring Cross-Desktop Group (XDG) data storage, nano explicitly requests directory mode 0777, making the directory world‑writable in environments where the process umask does not sufficiently restrict permissions. In systems with a relaxed or zero umask, such as container environments, CI/CD runners, embedded systems, or user shells configured with umask 000, this results in ~/.local being created as world‑writable. A local attacker can exploit a race window between nano’s creation of ~/.local and its subsequent creation of more restrictive subdirectories to write attacker‑controlled files into the victim’s XDG directory hierarchy.

This problem was fixed in nano version 9.0

Severity ?

2.1 (Low)


                  
                    CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-40556"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-732"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-28T15:16:30Z",
    "severity": "LOW"
  },
  "details": "GNU nano creates the user\u2019s ~/.local directory with overly permissive permissions when the directory does not exist yet. On first use of features requiring Cross-Desktop Group (XDG) data storage, nano explicitly requests directory mode 0777, making the directory world\u2011writable in environments where the process umask does not sufficiently restrict permissions.\nIn systems with a relaxed or zero umask, such as container environments, CI/CD runners, embedded systems, or user shells configured with umask 000, this results in ~/.local being created as world\u2011writable. A local attacker can exploit a race window between nano\u2019s creation of ~/.local and its subsequent creation of more restrictive subdirectories to write attacker\u2011controlled files into the victim\u2019s XDG directory hierarchy.\n\nThis problem was fixed in nano version 9.0",
  "id": "GHSA-9g7j-rcqf-cpcx",
  "modified": "2026-04-29T09:30:23Z",
  "published": "2026-04-28T15:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40556"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/04/CVE-2026-40556"
    },
    {
      "type": "WEB",
      "url": "https://cgit.git.savannah.gnu.org/cgit/nano.git/commit/?id=cb43493e"
    },
    {
      "type": "WEB",
      "url": "https://www.nano-editor.org"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-40556 (GCVE-0-2026-40556)

FKIE_CVE-2026-40556

MSRC_CVE-2026-40556

GHSA-9G7J-RCQF-CPCX

Tags

Sightings

Nomenclature