CVE-2026-86144

libxml2: libxml2: Information disclosure, SSRF, or denial of service due to improper parseFlags propagation.

Published Sep 5, 2026 CVSS 3.1 · 5.6 Medium EPSS < 1% KEV · Not listed
Description
In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8910-1 libxml2 vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title XInclude Parse Flags Not Propagated, Enabling XML External Entity, SSRF, or DoS in libxml2 libxml2: libxml2: Information disclosure, SSRF, or denial of service due to improper parseFlags propagation.
Weaknesses CWE-611
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Title XInclude Parse Flags Not Propagated, Enabling XML External Entity, SSRF, or DoS in libxml2
Type Values Removed Values Added
Description In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow).
First Time appeared Xmlsoft
Xmlsoft libxml2
Weaknesses CWE-669
CPEs cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
Vendors & Products Xmlsoft
Xmlsoft libxml2
References
Metrics cvssV3_1

{'score': 5.6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 8, 2026, 1:04 PM
Reserved
Sep 5, 2026, 4:34 AM
Status
Analyzed
Published
Sep 5, 2026, 5:17 AM
Modified
Sep 15, 2026, 7:20 PM
Severity
Moderate
Public date
Sep 5, 2026, 4:34 AM