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GHSA-gwm6-q8ch-hcfr

MediumCVSS 6.3 / 10
Published Jul 6, 2026·Last modified Jul 6, 2026
Affected Components(0)

No affected components available

Description

The -D path runs fs::create_dir_all on a pathname then later opens the destination via path-based File::create/fs::copy, neither anchored to a directory fd. Between the two, an attacker can replace a path component with a symlink, redirecting the write.

Impact: an attacker with concurrent write access to the destination tree can redirect a privileged install -D to an arbitrary location, enabling arbitrary file overwrite with attacker-controlled content. Recommendation: use dirfd-based traversal (openat/mkdirat + O_NOFOLLOW) per component and create the destination via openat on the same dirfd.

Remediation: Acknowledged by Canonical; fixed in commit 0c412999.


Reported by Zellic in the uutils coreutils Program Security Assessment (prepared for Canonical, Jan 20 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242. Finding 3.51. Credit: Zellic.

Risk Scores
Base Score
6.3

The vulnerability requires local access to the device to be exploited. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
5.8

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.11%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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