Vulnerabilities
Misconfiguration
Compliance
Cryptography
CVE Vulnerabilities

CVE-2026-6653

Use After Free

Published: Jun 22, 2026 | Modified: Oct 25, 2026
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
5.9 MODERATE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-6653
CWEhttps://cwe.mitre.org/data/definitions/416.html

Use After Free in libxml2s xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
Libxml2Xmlsoft2.9.11 (including)2.11.0 (including)
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.8*
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.8*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-9.el8_4.20*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatlibxml2-0:2.9.7-9.el8_4.20*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-13.el8_6.24*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatlibxml2-0:2.9.7-13.el8_6.24*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatlibxml2-0:2.9.7-16.el8_8.24*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.7-16.el8_8.24*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-14.el9_8.4*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-14.el9_8.4*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-3.el9_2.20*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-13.el9_4.10*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatlibxml2-0:2.9.13-13.el9_6*
Cert Manager support for Red Hat OpenShift release 1.17RedHatcert-manager/jetstack-cert-manager-acmesolver-rhel9:1791371080*
Cert Manager support for Red Hat OpenShift release 1.17RedHatcert-manager/jetstack-cert-manager-rhel9:1791371069*
Cert Manager support for Red Hat OpenShift release 1.17RedHatcert-manager/cert-manager-operator-rhel9:1791788287*
Cert Manager support for Red Hat OpenShift release 1.17RedHatcert-manager/cert-manager-istio-csr-rhel9:1791378395*
Cert Manager support for Red Hat OpenShift release 1.17RedHatcert-manager/cert-manager-operator-bundle:1791970484*
Cert Manager support for Red Hat OpenShift release 1.18RedHatcert-manager/jetstack-cert-manager-acmesolver-rhel9:1791459707*
Cert Manager support for Red Hat OpenShift release 1.18RedHatcert-manager/jetstack-cert-manager-rhel9:1791459711*
Cert Manager support for Red Hat OpenShift release 1.18RedHatcert-manager/cert-manager-istio-csr-rhel9:1791459759*
Cert Manager support for Red Hat OpenShift release 1.18RedHatcert-manager/cert-manager-operator-rhel9:1789029076*
Cert Manager support for Red Hat OpenShift release 1.18RedHatcert-manager/cert-manager-operator-bundle:1791966259*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/jetstack-cert-manager-rhel9:1790223279*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/cert-manager-istio-csr-rhel9:1790223719*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/cert-manager-operator-rhel9:1790272426*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/jetstack-cert-manager-acmesolver-rhel9:1790589998*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/jetstack-cert-manager-rhel9:1790589912*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/cert-manager-istio-csr-rhel9:1790589914*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/cert-manager-operator-rhel9:1790589855*
Cert Manager support for Red Hat OpenShift release 1.20RedHatcert-manager/cert-manager-trust-manager-rhel9:1790598593*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1788205779*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-spyre-rhel9:1793041986*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-rocm-rhel9:1793041981*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-cpu-rhel9:1793042072*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-cuda-rhel9:1793042067*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-tpu-rhel9:1793041987*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-cpu-rhel9:1793329709*
Red Hat OpenShift AI 3.0RedHatrhai/base-image-cuda-rhel9:1793328358*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-rocm-7.1-rhel9:1793042006*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-cuda-12.9-rhel9:1793042145*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-tpu-rhel9:1793042006*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-gaudi-rhel9:1793042011*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-cuda-13.0-rhel9:1793042086*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-cpu-rhel9:1793042088*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-rocm-6.4-rhel9:1793041995*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-spyre-rhel9:1793042074*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-neuron-rhel9:1793042008*
Red Hat OpenShift AI 3.4RedHatrhai/base-image-cuda-13.0-rhel9:1793326837*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-tpu-rhel9:1793042010*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-cpu-rhel9:1793042162*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-gaudi-rhel9:1793042004*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-rubin-rhel9:1793042092*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-cuda-12.9-rhel9:1793042117*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-cuda-13.0-rhel9:1793042093*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-spyre-rhel9:1793042114*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-rocm-7.14-rhel9:1793042024*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-neuron-rhel9:1793042008*
Red Hat OpenShift AI 3.5RedHatrhai/base-image-cuda-12.9-rhel9:1793327660*
Red Hat Update Infrastructure 5RedHatrhui5/cds-kubernetes-rhel9:1788880445*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1788880464*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1788880456*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1788765051*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1788880581*
Libxml2Ubuntujammy*
Libxml2Ubuntunoble*

Potential Mitigations

References

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