CVE-2026-88390CWE-787

CVE-2026-88390

High · published September 24, 2026

CVSS v3.1
7.7
EPSS
0%
Percentile
6.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00173 · 6.4th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-09-24T21:17Z
References (3)
https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c · [email protected]https://github.com/espruino/Espruino/issues/2744 · [email protected]https://github.com/espruino/Espruino/issues/2744 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 26 SEP 03:27Z
    EPSS moved — → 0%
    epss
  • 24 SEP 00:00Z
    An out-of-bounds write vulnerability in jslGetTokenValueAsString() in Espruino 2v29 (commit bffc6d0) allows crafted JavaScript input containing an overlong…
    cvelistv5