CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NCVE-2021-21366
Medium (4.3). EPSS 1.3% chance of exploitation in the next 30 days. Fixed in xmldom 0.5.0.
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. xmldom versions 0.4.0 and older do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. This may lead to unexpected syntactic changes during XML processing in some downstream applications. This is fixed in version 0.5.0. As a workaround downstream applications can validate the input and reject the maliciously crafted documents.
Severity
- EPSS
- 1.3% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-436, CWE-115
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- xmldom_project:xmldom
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-h6q6-9hqw-rwfv | npm | xmldom | <0.5.0 | 0.5.0 |
References
- https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135
- https://github.com/xmldom/xmldom/releases/tag/0.5.0
- https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfv
- https://lists.debian.org/debian-lts-announce/2023/01/msg00000.html
- https://www.npmjs.com/package/xmldom