{"id":"CVE-2026-88390","title":"An out-of-bounds write vulnerability in jslGetTokenValueAsString() in Espruino 2v29 (commit bffc6d0) allows crafted JavaScript input containing an overlong token to trigger a one-byte write beyond the JsLex.token buffer in RELEASE/NO_ASS…","summary":"An out-of-bounds write vulnerability in jslGetTokenValueAsString() in Espruino 2v29 (commit bffc6d0) allows crafted JavaScript input containing an overlong token to trigger a one-byte write beyond the JsLex.token buffer in RELEASE/NO_ASS…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-787"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T21:08:55.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88390","references":[{"url":"https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c","label":"cve@mitre.org"},{"url":"https://github.com/espruino/Espruino/issues/2744","label":"cve@mitre.org"},{"url":"https://github.com/espruino/Espruino/issues/2744","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-24T18:59:21.695501Z"},"ingestedAt":"2026-09-24T16:47:15.848Z","epss":0.00173,"epssPercentile":0.05931,"slug":"CVE-2026-88390","body":"## Overview\n\nAn out-of-bounds write vulnerability in jslGetTokenValueAsString() in Espruino 2v29 (commit bffc6d0) allows crafted JavaScript input containing an overlong token to trigger a one-byte write beyond the JsLex.token buffer in RELEASE/NO_ASSERT builds. The out-of-bounds write corrupts the adjacent tokenValue pointer, resulting in memory corruption and potentially causing application crashes or denial of service.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":210344,"id":"CVE-2026-88390","ts":1790279475859,"field":"exploit_available","old":"false","new":"true"},{"seq":210343,"id":"CVE-2026-88390","ts":1790279475859,"field":"cvss","old":null,"new":"7.7"},{"seq":210342,"id":"CVE-2026-88390","ts":1790279475859,"field":"severity","old":"none","new":"high"}]}