Vulnerability in Red Hat Hardened Images

[ Description ]Official description

A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential information disclosure due to a use-after-free vulnerability, which occurs when a program reads memory that has already been released. This issue arises when the archive_entry_copy_mac_metadata() function deallocates an internal buffer before completing a data copy. An attacker who can supply input to an application utilizing this function can trigger the flaw to crash the application or read uninitialized memory data.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4017

  libarchive: Vulnerability allows denial of service and information disclosure Translated from German

  CVE-2026-17591

[ References ]References

• access.redhat.com/errata/RHSA-2026:77775
• access.redhat.com/security/cve/CVE-2026-17591
• bugzilla.redhat.com/show_bug.cgi
• github.com/libarchive/libarchive/pull/3318