CVE-2026-66484: Path Traversal in GNU cpio

unknownCVE-2026-66484

CSIRTS triage

vendor: GNU product: cpio Path traversal

What: Path traversal vulnerability in GNU cpio allows extraction of files outside the intended directory.
Who is affected: Systems using GNU cpio to extract untrusted archives.
Urgency: Unknown severity requires assessment; path traversal can lead to arbitrary file overwrite.
Action: Check GNU cpio project for security advisories and apply patches when released.

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

⚡ Watch cpio

Get an email when a new cpio advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66484

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-2026-664840.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66484	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Path Traversal in

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.

highCVE-2026-65092: NVIDIA OpenShell Sandbox for Linux contains a vulnerability where an attacker could cause a pa…nvd · 2026-08-25
unknownCVE-2026-66152: A Path traversal vulnerability in OPSWAT tarball in the SonicWall NetExtender Linux client all…nvd · 2026-08-25
highGHSA-3vfr-4gwf-qxfp: Whistle vulnerable to path traversalghsa · 2026-08-25
highGHSA-mcj4-mphf-j9ff: Trivy has a path traversal via a crafted vulnerability database or other downloaded artif…ghsa · 2026-08-25
mediumGHSA-88g4-74f3-63x9: phpMyFAQ has Potential Authenticated Path Traversal in PDF Exportghsa · 2026-08-25
mediumCVE-2026-79781: rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to…nvd · 2026-08-25