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Vulnerability · Published Oct 16, 2026 · Assigned by redhat

CVE-2026-17591Libarchive: libarchive: use-after-free via aliased mac metadata copy

Low 3.6

In plain English

A low-severity use-after-free in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.6Low
Exploit odds (30 days)0.2%top 95.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libarchiveno fix listedDEBIAN-CVE-2026-17591
Debian:13libarchiveno fix listedDEBIAN-CVE-2026-17591
Debian:14libarchive3.8.9-1DEBIAN-CVE-2026-17591
Ubuntu:22.04:LTSlibarchiveno fix listedUBUNTU-CVE-2026-17591
Ubuntu:24.04:LTSlibarchiveno fix listedUBUNTU-CVE-2026-17591
Ubuntu:26.04:LTSlibarchiveno fix listedUBUNTU-CVE-2026-17591

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L

References