Use After Free in Red Hat Enterprise Linux 10
CVE-2026-17591
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.6 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-17591 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/libarchive/libarchive/pull/3318
- access.redhat.com/errata/RHSA-2026:77775 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-17591?
- CVE-2026-17591 is a low-severity vulnerability in Red Hat Enterprise Linux 10, classified under Use After Free. CVSS score: 3.6/10. Published 2026-10-16.
- How severe is CVE-2026-17591?
- Low severity. CVSS v3 base score is 3.6 out of 10.