CVE catalog
CVE-2026-103923
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. From 0.11.0 until 0.18.2, KaTeX uses ordinary JavaScript property access for the renderer options object, the trust s
- Severity
- Medium · CVSS 4.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.30% · Oct 25, 2026
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. From 0.11.0 until 0.18.2, KaTeX uses ordinary JavaScript property access for the renderer options object, the trust setting, default and processor setting metadata, and namespace lookup and group restoration, allowing inherited properties to be treated as explicitly supplied values. When Object.prototype is already polluted or an attacker controls the options object's prototype, attacker-controlled mathematical expressions can use an inherited trust value to enable trusted rendering and produce links capable of user-interaction cross-site scripting or loading attacker-selected external resources in a consuming application that inserts unsanitized KaTeX output into a page. KaTeX does not itself create the prototype pollution, and rendering an expression alone does not execute script. This issue is fixed in version 0.18.2.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-katex | sid | 0.16.10+~cs6.1.0-10 | fixed |
| Debian | node-katex | forky | 0.16.10+~cs6.1.0-10 | fixed |
| Debian | node-katex | trixie | 0.16.10+~cs6.1.0-2 | vulnerable |
| Debian | node-katex | bookworm | 0.16.4+~cs6.1.0-1 | vulnerable |
| Npm | katex | Not reported | 0.18.2 | fixed |
| Opensuse | python-jupyterlab-templates | tumbleweed | 0.5.3-3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-katex | source | sid | 0.16.10+~cs6.1.0-10 | not yet assigned | Not reported | [1149653] |
| Debian | node-katex | source | forky | 0.16.10+~cs6.1.0-10 | not yet assigned | Not reported | [1149653] |
| Debian | node-katex | source | trixie | (unfixed) | not yet assigned | Not reported | [1149653] |
| Debian | node-katex | source | bookworm | (unfixed) | not yet assigned | Not reported | [1149653] |
| Npm | katex | npm | Not reported | 0.18.2 | Not reported | GHSA-238P-PMPM-9MQ7 | Not reported |
| Opensuse | python-jupyterlab-templates | rpm | tumbleweed | 0.5.3-3.1 | Not reported | OPENSUSE-SU-2026:12075-1 | Not reported |
Notes
[trixie] node-katex: Minor issue [bookworm] node-katex: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fonts-katex]Affected
Source package: [node-katex]
Details (2)
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
- [katex]Affected
Source package: [node-katex]
Details (2)
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
- [libjs-katex]Affected
Source package: [node-katex]
Details (2)
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
0.16.4+~cs6.1.0-1· all · bookwormAffected
nvd · node-katex · debian · bookworm; nvd · node-katex · debian · 12
[Debian 13 (Trixie)]
- [fonts-katex]Affected
Source package: [node-katex]
Details (2)
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
- [katex]Affected
Source package: [node-katex]
Details (2)
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
- [libjs-katex]Affected
Source package: [node-katex]
Details (2)
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
0.16.10+~cs6.1.0-2· all · trixieAffected
nvd · node-katex · debian · 13
[openSUSE Tumbleweed]
- [jupyter-jupyterlab-templates]Unknown
Source package: [python-jupyterlab-templates]
Details (1)
0.5.3-2.3· noarch · tumbleweedUnknown · Fixed:
0.5.3-3.1Version impact unknown
nvd · python-jupyterlab-templates · opensuse · tumbleweed
- [python313-jupyterlab-templates]Unknown
Source package: [python-jupyterlab-templates]
Details (1)
0.5.3-2.3· noarch · tumbleweedUnknown · Fixed:
0.5.3-3.1Version impact unknown
nvd · python-jupyterlab-templates · opensuse · tumbleweed
- [python314-jupyterlab-templates]Unknown
Source package: [python-jupyterlab-templates]
Details (1)
0.5.3-2.3· noarch · tumbleweedUnknown · Fixed:
0.5.3-3.1Version impact unknown
nvd · python-jupyterlab-templates · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_12075-1.json]
- [https://github.com/advisories/GHSA-238p-pmpm-9mq7]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-103923]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-103923]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:12075-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-103923]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103923.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]