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CVE-2026-1757— Libxml2: memory leak leading to local denial of service in xmllint interactive shell

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libxml2是GNOME开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2存在安全漏洞，该漏洞源于交互式shell中内存释放不当，可能导致本地拒绝服务攻击。

CVSS 6.2 · Medium EPSS 0.19% · P9

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images 2.15.2-0.3.hum1< * unaffected
Red Hat Red Hat JBoss Core Services any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
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I. Basic Information for CVE-2026-1757

Vulnerability Information
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Vulnerability Title
Libxml2: memory leak leading to local denial of service in xmllint interactive shell
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
libxml2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libxml2是GNOME开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2存在安全漏洞，该漏洞源于交互式shell中内存释放不当，可能导致本地拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images 2.15.2-0.3.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat JBoss Core Services - cpe:/a:redhat:jboss_core_services:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-1757

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III. Intelligence Information for CVE-2026-1757

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Vendor Advisories for CVE-2026-1757 (2)

Other References for CVE-2026-1757 (1)

Same Patch Batch · Red Hat · 2026-02-02 · 6 CVEs total

CVE-2026-1761 8.6 HIGH Libsoup: stack-based buffer overflow in libsoup multipart response parsingmultipart http r
CVE-2026-1531 8.1 HIGH Foreman-kubevirt: foreman_kubevirt: man-in-the-middle due to insecure default ssl verifica
CVE-2026-1530 8.1 HIGH Fog-kubevirt: fog-kubevirt: man-in-the-middle vulnerability due to disabled certificate va
CVE-2026-1760 5.3 MEDIUM Libsoup: soupserver: denial of service via http request smuggling
CVE-2025-13881 2.7 LOW Org.keycloak.services.resources.admin: keycloak: limited administrator can retrieve sensit

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-401

V. Comments for CVE-2026-1757

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