Vulnerability-Lookup

GHSA-594M-24QW-WFMP

Vulnerability from github – Published: 2026-04-25 00:30 – Updated: 2026-04-25 00:30

Details

NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-42171"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-427"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T22:16:01Z",
    "severity": "HIGH"
  },
  "details": "NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).",
  "id": "GHSA-594m-24qw-wfmp",
  "modified": "2026-04-25T00:30:27Z",
  "published": "2026-04-25T00:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42171"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484"
    },
    {
      "type": "WEB",
      "url": "https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename"
    },
    {
      "type": "WEB",
      "url": "https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-42171 (GCVE-0-2026-42171)

Vulnerability from cvelistv5 – Published: 2026-04-24 21:20 – Updated: 2026-04-25 19:33

Summary

Severity

7.8 (High)


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

CWE

CWE-427 - Uncontrolled Search Path Element

Assigner

mitre

References

4 references

URL	Tags
https://nsis.sourceforge.io/Docs/AppendixF.html#v…
https://github.com/NSIS-Dev/nsis/commit/8e6f02205…
https://github.com/NSIS-Dev/nsis/blob/7359413009a…
https://learn.microsoft.com/en-us/windows/win32/a…

Impacted products

1 product

Vendor	Product	Version
Nullsoft	Nullsoft Scriptable Install System	Affected: 3.06.1 , < 3.12 (custom)

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JSON

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  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42171",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-25T01:56:27.818440Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-25T01:56:37.358Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Nullsoft Scriptable Install System",
          "vendor": "Nullsoft",
          "versions": [
            {
              "lessThan": "3.12",
              "status": "affected",
              "version": "3.06.1",
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                  "criteria": "cpe:2.3:a:nullsoft:nullsoft_scriptable_install_system:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.12",
                  "versionStartIncluding": "3.06.1",
                  "vulnerable": true
                }
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      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
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            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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  "cveMetadata": {
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    "datePublished": "2026-04-24T21:20:35.525Z",
    "dateReserved": "2026-04-24T21:20:35.145Z",
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}

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

GHSA-594M-24QW-WFMP

CVE-2026-42171 (GCVE-0-2026-42171)

Tags

Sightings

Nomenclature