Buffer overflow in N/a

CVE-2026-88378

QuickJS commit 04be24600 contains a heap out-of-bounds write condition in JS_ReadFunctionTag().

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-88378: held from 0.004 to 0.006.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-88378?
CVE-2026-88378 is a critical-severity vulnerability in N/a, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-09-24.
How severe is CVE-2026-88378?
Critical severity. CVSS v3 base score is 9.8 out of 10.