A double free issue has been identified in libarchive's RAR5 reader. During parsing of a specially crafted RAR5 archive, the filtered_buf pointer may remain stale after being freed during unpacking state reinitialization. Subsequent processing of another archive entry can trigger a second free of the same memory region, resulting in a double-free condition. Successful exploitation may cause applications using the vulnerable libarchive API to terminate unexpectedly, leading to a denial of service.
https://access.redhat.com/errata/RHSA-2026:63100
https://access.redhat.com/errata/RHSA-2026:63044
https://access.redhat.com/errata/RHSA-2026:63041
https://access.redhat.com/errata/RHSA-2026:61783
https://access.redhat.com/errata/RHSA-2026:58981
https://access.redhat.com/errata/RHSA-2026:58574
https://access.redhat.com/errata/RHSA-2026:58573
https://access.redhat.com/errata/RHSA-2026:58558
https://access.redhat.com/errata/RHSA-2026:56954
https://access.redhat.com/errata/RHSA-2026:54769
https://access.redhat.com/errata/RHSA-2026:54760
https://access.redhat.com/errata/RHSA-2026:54387
https://access.redhat.com/errata/RHSA-2026:52675