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CVE-2026-42171

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).
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7d10e1089af843676837c77f20035298639dc3f29598e6bc978b10e1074b298b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Nullsoft Scriptable Install System","vendor":"Nullsoft","versions":[{"lessThan":"3.12","status":"affected","version":"3.06.1","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-427","description":"CWE-427 Uncontrolled Search Path Element","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/references/2
{"url":"https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/references/1
{"url":"https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/references/3
{"url":"https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3425a5725af89d1b9bc2e63520abf4eb6ac4fbf9a27a87853d20db37d1459999 · sha256:e2120e2a051fd07a… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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