CVE-2026-17591

Libarchive: libarchive: use-after-free via aliased mac metadata copy

CVE-2026-17591 is fixed in libarchive on 1 platform by DEBIAN-CVE-2026-17591 (version 3.8.9-1), released October 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
3.6
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0015
4th percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
libarchive · Debian 14 3.8.9-1 DEBIAN-CVE-2026-17591 Oct 17, 2026

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