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Libxml2 EUVDEUVD-2026-71823

| CVE-2026-86144 HIGH
Incorrect Resource Transfer Between Spheres (CWE-669)
2026-09-05 mitre GHSA-h6w8-m27h-f268
Denial Of Service SSRF XXE Libxml2
7.8
CVSS 3.1 · NVD
Temporal: 5.6
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Vulnerability Assessment

Weakness
CWE
CWE-669
ASVS 5.0
V15 - Secure Coding and Architecture Incorrect resource transfer between spheres
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

SSRF, XXE and denial of service exposure arise in libxml2 before 2.15.4 because xmlXIncludeProcess and xmlXIncludeProcessTree fail to propagate the document's parseFlags down to the parser contexts they create for XInclude resolution. When parseFlags are dropped, protective options such as XML_PARSE_NONET stop being enforced, so an attacker-supplied document containing an external xi:include href can force outbound network fetches through the application's resource loader — enabling server-side request forgery, external entity injection, or a hang driven by an intentionally slow remote resource. Exploitation requires an application that enables XInclude and relies on XML_PARSE_NONET (typically with a custom resource loader); no public exploit code has been identified and EPSS is very low at 0.16% (6th percentile), with no CISA KEV listing.

Affected VersionsENISA

libxml2 0 <2.15.4

Affected Packages

euvd libxml2 fix: 2.15.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Severity by source

Vendor (mitre) PRIMARY MEDIUM
NVD 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal) 5.6 MEDIUM
vuln.today AI 6.5 MEDIUM

AV:N reflects realistic delivery via network-facing XML APIs; AC:H captures the compound prerequisites of XInclude use plus XML_PARSE_NONET reliance; S:C for outbound cross-boundary connections; C/I/A:L for limited SSRF/XXE/DoS impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:N/SA:N
SUSE 5.6 MEDIUM
AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Red Hat 5.6 MEDIUM

Primary rating from Vendor (mitre).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Sep 15, 2026 - 19:27 vuln.today
v2 - CVSS changed
Severity Changed
Sep 15, 2026 - 19:22 NVD
MEDIUM HIGH
CVSS changed
Sep 15, 2026 - 19:22 NVD
5.6 (MEDIUM) 7.8 (HIGH)
Patch available
Sep 05, 2026 - 06:01 EUVD
CVE Published
Sep 05, 2026 - 04:34 cve.org
MEDIUM 5.6

DescriptionNVD

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).

Threat Intelligence Overview

EPSS Score
0.2%
Top 94% exploitable
Data Quality
8 sources
Confidence: High
EUVD 🇯🇵JVN NVD CVE.org EPSS Vulnrichment MSRC Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Server-Side Request Forgery HIGH

Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.

XML External Entity Injection HIGH

XML External Entity (XXE) attacks exploit XML parsers that process Document Type Definitions (DTDs) without proper restrictions.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected
SUSE Linux Enterprise Micro 5.4 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:64463 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-86144 ADVISORY https://seclists.org/oss-sec/2026/q3/657 ADVISORY https://ubuntu.com/security/notices/USN-8910-1 ADVISORY https://vuldb.com/vuln/399210 REF https://github.com/GNOME/libxml2/commit/b63cd517afecb76582dd9488c55e54ceaf50de61 REF https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4

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