CVE-2026-88390 Memory corruption in n/a
Crafted JavaScript input triggers an out-of-bounds write in Espruino, causing memory corruption and potential denial of service in specific build configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88390?
CVE-2026-88390 is a high-severity memory corruption vulnerability in n/a, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-88390?
How do I fix CVE-2026-88390?
No fix has been published for CVE-2026-88390 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-88390 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88390 exists.
Sources
Also known as GHSA-5c5x-qcqw-7rfq.