--- id: CVE-2026-4111 title: >- A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path summary: >- A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-835 - CWE-835 published: '2026-03-13' updated: '2026-08-31' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4111' references: - url: 'https://access.redhat.com/errata/RHSA-2026:10065' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:10081' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:10097' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:14773' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:15087' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:16008' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:16009' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:16174' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:17596' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:25096' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:5063' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:5080' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:6647' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7093' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7105' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7106' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7239' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7329' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7335' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8423' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8746' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8747' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8748' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8865' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:8944' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:9832' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-4111' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2446453' label: secalert@redhat.com - url: 'https://github.com/libarchive/libarchive/pull/2877' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:10065' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:10081' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:10097' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:14773' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:15087' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16008' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16009' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16174' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:17596' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:25096' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:5063' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:5080' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:6647' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7093' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7105' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7106' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7239' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7329' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7335' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8423' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8746' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8747' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8748' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8865' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8944' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:9832' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-4111' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2446453' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4111.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c tags: - nvd epss: 0.00882 epssPercentile: 0.5737 ingestedAt: '2026-08-31T18:12:24.310Z' --- ## Overview A flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.