{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42171 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-42171 is a high-severity vulnerability in Nullsoft Scriptable Install System, published on 24 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-42171 and fix it if it is affected.\n\nWhat it is: CVE-2026-42171 is a high-severity vulnerability in Nullsoft Scriptable Install System, published on 24 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-42171 in the wild and no public exploit code.\n\nAffected product: Nullsoft Scriptable Install System. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42171/ (Markdown: https://insights.sbomify.com/CVE-2026-42171/index.md)","id":"CVE-2026-42171","markdown":"https://insights.sbomify.com/CVE-2026-42171/index.md","name":"CVE-2026-42171","record":{"aliases":["DEBIAN-CVE-2026-42171","GHSA-594m-24qw-wfmp","UBUNTU-CVE-2026-42171"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"NSIS installer","requires_auth":"none","summary":"Local attackers can escalate privileges by exploiting insecure temp directory usage in NSIS when running as SYSTEM.","user_interaction":"required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"nullsoft_scriptable_install_system","vendor":"nullsoft"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-427","name":"Uncontrolled Search Path Element"}],"description":"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).","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Privilege escalation in Nullsoft Scriptable Install System","id":"CVE-2026-42171","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Coolify: Sanctum API Tokens Have No Expiration — Leaked Tokens Grant Permanent Access","id":"CVE-2026-42172"},"packages":[],"prev":{"headline":"Gimp: gimp dds plug-in heap-based buffer overflow via bpp mismatch in load_layer() (ddsread.c)","id":"CVE-2026-42170"},"products":["Nullsoft Scriptable Install System"],"published":"2026-04-24","related":[{"cvss_score":5.3,"headline":"Missing authorization in n/a","id":"CVE-2023-37378","kev_date_added":null,"published":"2023-07-03"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-25","vendors":["Nullsoft"]},"summary":"Local attackers can escalate privileges by exploiting insecure temp directory usage in NSIS when running as SYSTEM.","url":"https://insights.sbomify.com/CVE-2026-42171/"}