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Vulnerability · Published Oct 9, 2026 · Assigned by redhat

CVE-2026-108119Busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses cve-2026-26158 fix

Medium 6.3

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 6 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.1%top 97.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly '..' combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12busyboxno fix listedDEBIAN-CVE-2026-108119
Debian:13busyboxno fix listedDEBIAN-CVE-2026-108119
Debian:14busyboxno fix listedDEBIAN-CVE-2026-108119
Ubuntu:22.04:LTSbusyboxno fix listedUBUNTU-CVE-2026-108119
Ubuntu:24.04:LTSbusyboxno fix listedUBUNTU-CVE-2026-108119
Ubuntu:26.04:LTSbusyboxno fix listedUBUNTU-CVE-2026-108119
Ubuntu:26.10busyboxno fix listedUBUNTU-CVE-2026-108119

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-59 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

References