CVE-2026-86144

SSRF via dropped XInclude parser flags

Published Sep 5, 2026 · Updated Sep 8, 2026

SSRF in XInclude processing in XMLSoft libxml2 before 2.15.4 allows local users to trigger outbound requests via crafted XML. The xmlXIncludeProcess and xmlXIncludeProcessTree entry points pass zero rather than the document parseFlags, so XML_PARSE_NONET is lost while resolving an XInclude. Exploitation requires an application that processes attacker-controlled XIncludes with a custom resource loader; requests can reach internal or slow external resources, causing data exposure or a service hang.

CVSS severity5.6
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SSRF in XInclude processing in XMLSoft libxml2 before 2.15.4 allows local users to trigger outbound requests via crafted XML. The xmlXIncludeProcess and xmlXIncludeProcessTree entry points pass zero rather than the document parseFlags, so XML_PARSE_NONET is lost while resolving an XInclude. Exploitation requires an application that processes attacker-controlled XIncludes with a custom resource loader; requests can reach internal or slow external resources, causing data exposure or a service hang.

The record

CVE
CVE-2026-86144
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
XMLSoft
Product
libxml2
Classifications
CWE-669
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.15.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

XMLSoft · libxml2version=0 <2.15.4

Published CVSS scores

5.6CVE ProgramCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-669Incorrect Resource Transfer Between Spheres

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo