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://github.com/libarchive/libarchive/pull/3071
https://github.com/libarchive/libarchive/issues/3069
https://bugzilla.redhat.com/show_bug.cgi?id=2493411