openEuler 20.03 LTS SP4 update for libxml2



Risk High
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2025-49794
CVE-2025-49796
CVE-2025-6170
CWE-ID CWE-416
CWE-843
CWE-121
Exploitation vector Network
Public exploit N/A
Vulnerable software
 openEuler
Operating systems & Components / Operating system

libxml2-help
Operating systems & Components / Operating system package or component

python3-libxml2
Operating systems & Components / Operating system package or component

python2-libxml2
Operating systems & Components / Operating system package or component

libxml2-devel
Operating systems & Components / Operating system package or component

libxml2-debugsource
Operating systems & Components / Operating system package or component

libxml2-debuginfo
Operating systems & Components / Operating system package or component

libxml2
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU111221

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-49794

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the xmlSchematronGetNode() function when processing XPath expressions in Schematron schema elements schematron.c. A remote attacker can pass specially crafted XML input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP4

libxml2-help: before 2.9.10-48

python3-libxml2: before 2.9.10-48

python2-libxml2: before 2.9.10-48

libxml2-devel: before 2.9.10-48

libxml2-debugsource: before 2.9.10-48

libxml2-debuginfo: before 2.9.10-48

libxml2: before 2.9.10-48

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1898


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Type Confusion

EUVDB-ID: #VU111223

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-49796

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a type confusion error within the xmlSchematronFormatReport() function when processing sch:name elements in schematron.c. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and crash the application. 

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP4

libxml2-help: before 2.9.10-48

python3-libxml2: before 2.9.10-48

python2-libxml2: before 2.9.10-48

libxml2-devel: before 2.9.10-48

libxml2-debugsource: before 2.9.10-48

libxml2-debuginfo: before 2.9.10-48

libxml2: before 2.9.10-48

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1898


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Stack-based buffer overflow

EUVDB-ID: #VU111224

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-6170

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in xmllint Shell - shell.c. A remote attacker can pass specially crafted input to the application, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP4

libxml2-help: before 2.9.10-48

python3-libxml2: before 2.9.10-48

python2-libxml2: before 2.9.10-48

libxml2-devel: before 2.9.10-48

libxml2-debugsource: before 2.9.10-48

libxml2-debuginfo: before 2.9.10-48

libxml2: before 2.9.10-48

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1898


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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