CVE-2026-110715

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

6.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: High

Exploit likelihood

0.17%Unchanged since Oct 15, 2026

What each source reports

CVE List Score used 6.9

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

Record: CVE-2026-110715
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Weakness: CWE-787
Updated: 2026-11-02

EUVDEUVD-2026-101138 6.9

Record: EUVD-2026-101138
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-45w2-9pc7-5crm 6.9

MuJS 1.3.6 before 1.3.9 contains a heap out-of-bounds read and write vulnerability in Array...

Record: GHSA-45w2-9pc7-5crm
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Weakness: CWE-787
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-110715
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Weakness: CWE-787
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-110715 6.9

Record: DEBIAN-CVE-2026-110715
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-110715 6.9

Record: UBUNTU-CVE-2026-110715
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mujs` Debian:12	All versions, plus listed versions 1.3.10-11.3.10-21.3.11-11.3.2-11.3.3-1 Show 8 moreShow less 1.3.3-21.3.3-31.3.5-11.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	None known
`mujs` Debian:13	All versions, plus listed versions 1.3.10-11.3.10-21.3.11-11.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	None known
`mujs` Debian:14	before 1.3.11-1, plus listed versions 1.3.10-11.3.10-21.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	1.3.11-1
`mujs` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1.1.0-11.1.3-21.1.3-31.1.3-3ubuntu0.1~esm1	None known
`mujs` Ubuntu:24.04:LTS	All versions, plus listed versions 1.3.3-11.3.3-21.3.3-31.3.3-3build11.3.3-3build2	None known
`mujs` Ubuntu:26.10	All versions, plus listed versions 1.3.8-21.3.9-1	None known
`mujs` Ubuntu:26.04:LTS	All versions, plus listed versions 1.3.6-11.3.8-2	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-110715 is a medium vulnerability (CVSS 6.9) in Artifex Software Mujs, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in mujs 1.3.11-1.

References

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