CVE-2025-49796Network attack vector

Application crash via Schematron type confusion

Published Jun 16, 2025 · Updated Aug 16, 2026

Type confusion in libxml2 before 2.15.0 allows attackers to crash XML-processing applications using crafted Schematron input. xmlSchematronReportOutput treats values produced while expanding sch:name path expressions as the wrong internal object type, causing invalid memory access. An application must enable Schematron validation and process attacker-controlled input; exploitation interrupts that process and can corrupt its memory.

CVSS severity9.1
Critical
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in libxml2 before 2.15.0 allows attackers to crash XML-processing applications using crafted Schematron input. xmlSchematronReportOutput treats values produced while expanding sch:name path expressions as the wrong internal object type, causing invalid memory access. An application must enable Schematron validation and process attacker-controlled input; exploitation interrupts that process and can corrupt its memory.

The record

CVE
CVE-2025-49796
Published
Jun 16, 2025
Updated
Aug 16, 2026
Vendor
XMLSoft
Product
libxml2
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <2.15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

XMLSoft · libxml2version=0 <2.15.0
Siemens · RUGGEDCOM ROX RX1500version=0 <V2.17.1
389 Directory Server · cert-manager Operator for Red Hat OpenShiftAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX5000version=0 <V2.17.1
Siemens · RUGGEDCOM ROX RX1511version=0 <V2.17.1
Siemens · RUGGEDCOM ROX MX5000REversion=0 <V2.17.1
Siemens · RUGGEDCOM ROX RX1536version=0 <V2.17.1
389 Directory Server · Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.17Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.18Affected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1512version=0 <V2.17.1
389 Directory Server · Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsAffected versions are unavailable in this record.
389 Directory Server · File Integrity OperatorAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.19Affected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1510version=0 <V2.17.1
389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9.4 Extended Update SupportAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.13Affected versions are unavailable in this record.
389 Directory Server · Red Hat Insights proxy 1.5Affected versions are unavailable in this record.
Siemens · RUGGEDCOM RST2428Pversion=0 <V4.0
Siemens · RUGGEDCOM ROX RX1524version=0 <V2.17.1
389 Directory Server · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.12Affected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1501version=0 <V2.17.1
389 Directory Server · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnAffected versions are unavailable in this record.
389 Directory Server · Red Hat Discovery 2Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.14Affected versions are unavailable in this record.
389 Directory Server · Red Hat Web TerminalAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.2 Advanced Update SupportAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7 Extended Lifecycle SupportAffected versions are unavailable in this record.
Siemens · RUGGEDCOM ROX RX1400version=0 <V2.17.1
Siemens · RUGGEDCOM ROX MX5000version=0 <V2.17.1
389 Directory Server · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.20Affected versions are unavailable in this record.

Published CVSS scores

9.1Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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

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Your stack

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