CVE-2026-14164: Libarchive: double-free vulnerability in rar5 decompression logic via dangling filtered_buf pointer in init_unpack()

highCVSS 7.5CVE-2026-14164

CSIRTS triage

vendor: Libarchive product: libarchive Memory corruption

What: A double-free vulnerability exists in the rar5 decompression logic due to a dangling filtered_buf pointer.
Who is affected: Deployments of libarchive that handle rar5 files are affected.
Urgency: Remediation is urgent due to the high severity and potential for exploitation.
Action: Update to the latest version of libarchive to mitigate this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-14164

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-141640.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-14164	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownUSN-8581-1: libarchive vulnerabilitiesubuntu
unknownMultiple vulnerabilities in Microsoft Azure Linux (July 10, 2026)cert-fr-avis
highCVE-2026-14164: A double free issue has been identified in libarchive's RAR5 reader. During parsing of a speci…nvd

Recent advisories for Libarchive

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

low[NEW] [low] libarchive: Vulnerability allows unspecified attackcert-bund · 2026-07-23
low[NEW] [low] libarchive: Vulnerability allows code execution and DoScert-bund · 2026-07-22
medium[UPDATE] [medium] libarchive: Vulnerability allows denial of servicecert-bund · 2026-07-22
lowCVE-2026-16517: A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_w…nvd · 2026-07-21
unknownUSN-8581-1: libarchive vulnerabilitiesubuntu · 2026-07-21
lowCVE-2026-15028: Libarchive: heap overflow oob read while parsing a tar archive contains a pax extended headermsrc · 2026-07-14