[NEW] [low] cpio: Multiple vulnerabilities

lowCVE-2026-66484 CVE-2026-66485 CVE-2026-66486

A remote, anonymous attacker can exploit multiple vulnerabilities in cpio to bypass security measures, cause a denial of service, or manipulate data.

CSIRTS triage

vendor: cpio product: cpio Authentication bypass Denial of service Path traversal

What: Multiple vulnerabilities in cpio allow attackers to bypass security measures, cause denial of service, or manipulate data.
Who is affected: All cpio deployments are affected; specific versions not stated.
Urgency: Low—severity rated low with no active exploitation reported.
Action: Apply available cpio security patches when released.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: low
Published: 2026-08-13
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2722

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.
Low exploitation riskCVE-2026-664850.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-664860.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66484	coverage & exploitation status	NVD · CVE.org
CVE-2026-66485	coverage & exploitation status	NVD · CVE.org
CVE-2026-66486	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 cpio

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.

unknownCVE-2026-66486: Improper Output Encoding in GNU cpiomsrc · 2026-08-11
unknownCVE-2026-66484: Path Traversal in GNU cpiomsrc · 2026-08-11
unknownCVE-2026-66485: Uncontrolled Memory Allocation in GNU cpiomsrc · 2026-08-11
unknownCVE-2026-66486: GNU cpio is vulnerable to improper encoding or escaping of output in its archive member listin…nvd · 2026-08-10
unknownCVE-2026-66485: GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/m…nvd · 2026-08-10
unknownCVE-2026-66484: GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. …nvd · 2026-08-10