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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libarchive · Debian 14 | 3.8.9-1 | DEBIAN-CVE-2026-17591 | Oct 17, 2026 |
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