---
cve: "CVE-2026-66485"
severity: "MEDIUM"
cvss: 4.6
epss: "0.1%"
vendor: "GNU"
kev: false
exploited: false
published: "2026-08-10 11:17:27"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T01:13:44+02:00"
---

# CVE-2026-66485

> 4.6 MEDIUM

## Beschreibung

GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service.

This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Referenzen

- <https://cert.pl/en/posts/2026/08/CVE-2026-66484>
- <https://git.savannah.gnu.org/cgit/cpio.git>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66485) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_