Buffer overflow in Artifex Software Mujs
CVE-2026-110715
MuJS 1.3.6 before 1.3.9 contains a heap out-of-bounds read and write vulnerability in Array.prototype.sort that allows attackers to corrupt memory by inflating a simple array's length. Attackers can supply JavaScript that enlarges a dense array's length and calls sort, causing Ap_sort_cmp and Ap_sort_swap to access slots past the buffer and crash the process.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/mujs-array-length-flat-oob (technical-description, exploit)
- codeberg.org/ccxvii/mujs/src/commit/307f18c4216420f2f56e22d8e7040baa39a6304a/js… (technical-description)
- codeberg.org/ccxvii/mujs/commit/32064e10caa45e68fc87331ca53d042049cc9396 (patch)
- mujs.com/downloads/ (release-notes)
- codeberg.org/ccxvii/mujs (product)
- www.vulncheck.com/advisories/mujs-1.3.6-before-1.3.9-heap-out-of-bounds-read-wr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110715?
- CVE-2026-110715 is a medium-severity vulnerability in Artifex Software Mujs, classified under Out-of-bounds Write. CVSS score: 6.1/10. Published 2026-10-14.
- How severe is CVE-2026-110715?
- Medium severity. CVSS v3 base score is 6.1 out of 10.