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Vulnerability · Published Sep 24, 2026 · Assigned by mitre

CVE-2026-88362

High 7.5

In plain English

A high-severity security flaw in the mujs package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 63.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12mujsno fix listedDEBIAN-CVE-2026-88362
Debian:13mujsno fix listedDEBIAN-CVE-2026-88362
Debian:14mujs1.3.10-2DEBIAN-CVE-2026-88362
Ubuntu:24.04:LTSmujsno fix listedUBUNTU-CVE-2026-88362
Ubuntu:26.04:LTSmujsno fix listedUBUNTU-CVE-2026-88362
Ubuntu:26.10mujsno fix listedUBUNTU-CVE-2026-88362

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-681 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References