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Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck

CVE-2026-110715MuJS 1.3.6 before 1.3.9 Heap Out-of-Bounds Read/Write via Array.prototype.sort

Medium 6.1

In plain English

A medium-severity out-of-bounds write in MuJS from Artifex Software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 93.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12mujsno fix listedDEBIAN-CVE-2026-110715
Debian:13mujsno fix listedDEBIAN-CVE-2026-110715
Debian:14mujs1.3.11-1DEBIAN-CVE-2026-110715
Ubuntu:24.04:LTSmujsno fix listedUBUNTU-CVE-2026-110715
Ubuntu:26.04:LTSmujsno fix listedUBUNTU-CVE-2026-110715
Ubuntu:26.10mujsno fix listedUBUNTU-CVE-2026-110715

Affected products (as reported)

VendorProductVersions
Artifex Software MuJS 1.3.6 – before 1.3.9

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

References