Medium [CVE-2026-83611] Malformed XML end tag parsing leads to content discard and security bypass
This medium-severity Red Hat Linux advisory covers CVE-2026-83611 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in xmldom, a JavaScript XML DOM parser. The DOMParser.parseFromString() function can silently accept malformed XML end tags that include a line break and additional content.
This unexpected parsing behavior causes the parser to close the element prematurely and discard the trailing content. This could potentially bypass security checks that rely on strict XML well-formedness, leading to data loss or misinterpretation in applications processing untrusted XML input.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-1286.
Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 60 minutes ago·verify at source
- 0.8.15
- 0.9.12
Official advisory · high-confidence parse· fetched 60 minutes ago·verify at source
Mitigation
Upgrade to a fixed release: 0.8.15, 0.9.12. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 60 minutes ago·verify at source
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