{"id":"CVE-2026-6539","aliases":["EUVD-2026-26436","GHSA-vfqp-r766-g759"],"status":"published","title":"Notepad++ 8.9.3 Format String Injection via nativeLang.xml","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","severity":{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00191,"percentile":0.08744,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-134"],"published":"2026-04-30T20:31:54Z","modified":"2026-10-28T02:30:39Z","products":[{"vendor":"notepad++","product":"notepad++"},{"vendor":"notepad-plus-plus","product":"notepad\\+\\+"}],"references":[{"url":"https://notepad-plus-plus.org/news/v894-released/","tags":["patch","Release Notes","fix"]},{"url":"https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6539","tags":["advisory"]},{"url":"https://notepad-plus-plus.org/news/v894-released"},{"url":"https://github.com/advisories/GHSA-vfqp-r766-g759"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6539.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-6539","title":"Notepad++ 8.9.3 Format String Injection via nativeLang.xml","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","status":"published","published":"2026-04-30T20:31:54.961Z","modified":"2026-07-28T01:50:02.169Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":4.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T13:49:53.818886Z"}],"euvd":[{"id":"EUVD-2026-26436","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","status":"published","published":"2026-04-30T20:31:54Z","modified":"2026-07-28T01:50:02Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:02:32.258903Z"}],"ghsa":[{"id":"GHSA-vfqp-r766-g759","title":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel...","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","status":"published","published":"2026-04-30T21:30:39Z","modified":"2026-04-30T21:30:44Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/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","level":"medium"},{"version":"3.1","score":4.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","level":"medium"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T15:07:52.236911Z"}],"nvd":[{"id":"CVE-2026-6539","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","status":"published","published":"2026-04-30T21:16:33.82Z","modified":"2026-06-17T11:00:57.383Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T14:12:16.626888Z"}],"osv":[{"id":"CVE-2026-6539","title":"Notepad++ 8.9.3 Format String Injection via nativeLang.xml","description":"Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.","status":"published","published":"2026-04-30T20:31:54.961Z","modified":"2026-10-28T02:30:39.836731052Z","cvss":[{"version":"4.0","score":4.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-134"],"updated_at":"2026-11-02T15:45:14.096824Z"}]}}