In Artifex MuJS through 1.2.0, jsP_dumpsyntax in jsdump.c has a NULL pointer dereference, as demonstrated by mujs-pp.

published 2022-05-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-52691

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

Patch / fix

distros 3 links 1

debian ubuntu alpine

mujs Debian 14, Debian 13, Debian 12 1.2.0-3

debian advisories DEBIAN-CVE-2022-30975

mujs Ubuntu Pro 22.04 LTS 1.1.3-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2022-30975

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

mujs Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 1.3.0-r0

alpine advisories ALPINE-CVE-2022-30975

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/ccxvii/mujs/issues/161 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-30975 updated 2025-11-21 cvss 7.5

mujs: NULL pointer dereference in jsP_dumpsyntax() in jsdump.c

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/ccxvii/mujs/issues/161 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /ccxvii/mujs/issues/161
exploit, issue-tracking, patch, third-party-advisory
debian.org /security/2022/dsa-5291
vendor-advisory, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/MC6PLHTXHZ7GW7QQGTLBHLXL47UHTHXO/
vendor-advisory

Sources

CVE List CVE-2022-30975
NVD CVE-2022-30975

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary