MinorCritical vulnerability

CVE-2026-88390 (CVSS 7.7)

NVD · officialPublished Sep 24, 2026Risk 23/100

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_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.

Technical details

CVSS

7.7

AV:LocalAC:LowPR:NoneUI:NoneC:NoneI:HighA:High

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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