CVE-2026-17591Libarchive: libarchive: use-after-free via aliased mac metadata copy
Updated under an hour ago ()
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It affects Red Hat Hardened Images and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.6 LOW (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Received
- Record last updated
- Oct 17, 2026
- First seen by InfoSec Signals
- Oct 16, 2026
Affected products
Red Hat Red Hat Hardened Images redhat:hummingbird | from 3.8.9-2.1.hum1 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:77775vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-17591vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2554209issue-tracking, x-refsource-redhat
- https://github.com/libarchive/libarchive/pull/3318
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.