CVE-2026-88362

MuJS e892c9fdb contains an incorrect numeric conversion vulnerability in jsR_isindex() in jsrun.c...

7.5 HighFix available

MuJS e892c9fdb contains an incorrect numeric conversion vulnerability in jsR_isindex() in jsrun.c. A specially crafted JavaScript input containing an excessively large numeric array index can cause an out-of-range floating-point value to be converted to an integer without proper range validation. This results in undefined behavior and can cause process termination, leading to denial of service.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.42%Up 0.3 points since Sep 25, 2026

What each source reports

CVE List Score used 7.5

Record: CVE-2026-88362
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-681
Updated: 2026-11-02

EUVDEUVD-2026-86283 7.5

Record: EUVD-2026-86283
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-jh95-x4h9-f49q 7.5

MuJS e892c9fdb contains an incorrect numeric conversion vulnerability in jsR_isindex() in jsrun.c...

Record: GHSA-jh95-x4h9-f49q
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-681
Updated: 2026-11-02

NVD 7.5

Record: CVE-2026-88362
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-681
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-88362 7.5

Record: DEBIAN-CVE-2026-88362
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-88362 7.5

Record: UBUNTU-CVE-2026-88362
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`mujs` Debian:12	All versions, plus listed versions 1.3.10-11.3.10-21.3.2-11.3.3-11.3.3-2 Show 7 moreShow less 1.3.3-31.3.5-11.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	None known
`mujs` Debian:13	All versions, plus listed versions 1.3.10-11.3.10-21.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	None known
`mujs` Debian:14	before 1.3.10-2, plus listed versions 1.3.10-11.3.6-11.3.7-11.3.8-11.3.8-21.3.9-1	1.3.10-2
`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-2026-88362 is a high vulnerability (CVSS 7.5) in mujs, published September 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in mujs 1.3.10-2.