{"id":"CVE-2026-86716","summary":"Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow","details":"A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skip_spaces_and_comments of the file src/mjs_tok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.","modified":"2026-10-28T02:31:03.880624525Z","published":"2026-09-08T18:45:05.842Z","database_specific":{"cna_assigner":"VulDB","cwe_ids":["CWE-119","CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86716.json","unresolved_ranges":[{"extracted_events":[{"range":[{"introduced":"1.0"},{"last_affected":"1.0"},{"introduced":"1.1"},{"last_affected":"1.1"},{"introduced":"1.2"},{"last_affected":"1.2"},{"introduced":"1.3"},{"last_affected":"1.3"},{"introduced":"1.4"},{"last_affected":"1.4"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"}]}]},"references":[{"type":"WEB","url":"https://github.com/cesanta/mjs/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86716.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86716"},{"type":"ADVISORY","url":"https://vuldb.com/cve/CVE-2026-86716"},{"type":"ADVISORY","url":"https://vuldb.com/submit/910881"},{"type":"ADVISORY","url":"https://vuldb.com/submit/910882"},{"type":"ADVISORY","url":"https://vuldb.com/vuln/399773"},{"type":"REPORT","url":"https://github.com/cesanta/mjs/issues/324"},{"type":"REPORT","url":"https://vuldb.com/vuln/399773/cti"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cesanta/mjs","events":[{"introduced":"422ca2706b4a334584341c2fc7e4c6f125280f69"},{"last_affected":"30aa0f84dbb274afdd95006ed18431e131654cac"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"1.5"},{"last_affected":"1.5"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"range":[{"introduced":"1.6"},{"last_affected":"1.6"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"range":[{"introduced":"1.7"},{"last_affected":"1.7"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.8"},{"last_affected":"1.8"}]},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.9"},{"last_affected":"1.9"}],"source":"AFFECTED_FIELD"},{"range":[{"introduced":"1.10"},{"last_affected":"1.10"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"range":[{"introduced":"1.11"},{"last_affected":"1.11"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.12"},{"last_affected":"1.12"}]},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.13"},{"last_affected":"1.13"}]},{"range":[{"introduced":"1.14"},{"last_affected":"1.14"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"range":[{"introduced":"1.15"},{"last_affected":"1.15"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.16"},{"last_affected":"1.16"}]},{"range":[{"introduced":"1.17"},{"last_affected":"1.17"}],"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.18"},{"last_affected":"1.18"}]},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.19"},{"last_affected":"1.19"}],"source":"AFFECTED_FIELD"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.20"},{"last_affected":"1.20"}]},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.21"},{"last_affected":"1.21"}],"source":"AFFECTED_FIELD"},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.22"},{"last_affected":"1.22"}],"source":"AFFECTED_FIELD"},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.23"},{"last_affected":"1.23"}],"source":"AFFECTED_FIELD"},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.24"},{"last_affected":"1.24"}],"source":"AFFECTED_FIELD"},{"strategy":"StandaloneSingleVersion","range":[{"introduced":"1.25"},{"last_affected":"1.25"}],"source":"AFFECTED_FIELD"},{"source":"AFFECTED_FIELD","strategy":"StandaloneSingleVersion","range":[{"introduced":"1.26"},{"last_affected":"1.26"}]},{"range":[{"introduced":"0"},{"last_affected":"1.26"}],"source":"DESCRIPTION"}]}}],"versions":["1.10","1.11","1.12","1.15","1.16","1.18","1.19","1.20","1.21","1.22","1.23","1.24","1.25","1.26","1.5","1.6","1.7","1.22.1","1.20.1","ddd","1.19.6","1.19.5","1.19.4","1.19.3","1.19.2","1.19.1","1.17","1.14","1.13","1.9","1.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86716.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"}]}