CVE-2026-110715
MuJS 1.3.6 before 1.3.9 Heap Out-of-Bounds Read/Write via Array.prototype.sort
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | artifex software |
| Product | mujs |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
Artifex Software / MuJS
1.3.6 < 1.3.9
References
hackmd.io: https://hackmd.io/@haind-pwn/mujs-array-length-flat-oob codeberg.org: https://codeberg.org/ccxvii/mujs/src/commit/307f18c4216420f2f56e22d8e7040baa39a6304a/jsarray.c#L245 codeberg.org: https://codeberg.org/ccxvii/mujs/commit/32064e10caa45e68fc87331ca53d042049cc9396 mujs.com: https://mujs.com/downloads/ codeberg.org: https://codeberg.org/ccxvii/mujs vulncheck.com: https://www.vulncheck.com/advisories/mujs-1.3.6-before-1.3.9-heap-out-of-bounds-read-write-via-array-prototype-sort
Credits
HaiND from the Post and Telecommunication Institute of Technology