CVE-2026-86138

libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow

Published Sep 5, 2026 CVSS 3.1 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

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 libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow
Weaknesses CWE-787
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Description In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.
First Time appeared Xmlsoft
Xmlsoft libxml2
Weaknesses CWE-190
CPEs cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
Vendors & Products Xmlsoft
Xmlsoft libxml2
References
Metrics cvssV3_1

{'score': 6.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 8, 2026, 6:04 PM
Reserved
Sep 5, 2026, 4:21 AM
Status
Analyzed
Published
Sep 5, 2026, 5:17 AM
Modified
Sep 15, 2026, 7:40 PM
Severity
Moderate
Public date
Sep 5, 2026, 4:21 AM