Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-17591
Red Hat Red Hat Hardened Images — Libarchive: libarchive: use-after-free via aliased mac metadata copy
AV AC PR UI S C I A CVSS EPSS %ile KEV
L H N R U L N L 3.6 .0011 1.2 —
AFFECTED
Product Versions Fixed
Red Hat Hardened Images unspecified 3.8.9-2.1.hum1
Red Hat Enterprise Linux 10 unspecified —
Red Hat Enterprise Linux 6 unspecified —
Red Hat Enterprise Linux 7 unspecified —
Red Hat Enterprise Linux 8 unspecified —
Red Hat Enterprise Linux 9 unspecified —
TIMELINE
Jul 27 Reserved by redhat
Oct 16 Published (CNA: redhat)
Oct 17 PATCH SHIPPED — CVE-2026-17591 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 3.8.9-2.1.hum1.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 27, 2026 | Reserved | Reserved by redhat |
| October 16, 2026 | Published | Published (CNA: redhat) |
| October 17, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-17591 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 3.8.9-2.1.hum1. |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Hardened Images | — | — | 3.8.9-2.1.hum1 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-17591 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
