Skip to main content

Boteraser | Website and Server Security Solutions

🛡️ CVE-2026-35341 — coreutils

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-732 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

mkfifo: permissions of an existing file are changed after FIFO creation fails

When mkfifo() fails (e.g. target already exists), the code shows an error but is missing a continue;, so it falls through to fs::set_permissions and changes the permissions of the pre-existing file to the default FIFO mode (0o666 & umask -> 0644).

```

$ touch secret; chmod 000 secret

$ coreutils mkfifo secret fifo3 fifo4

mkfifo: cannot create fifo 'secret': File exists

$ ll secret # uutils:

prw-r--r-- secret # changed to 644 (GNU leaves it 000)

```

Impact: an attacker (or user error) can relax permissions on sensitive owner-only files such as SSH private keys, exposing them to other users. Recommendation: add continue; after the error.

Remediation: Acknowledged by Canonical; fixed in PR #10376.

_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242. Finding 3.8. Credit: Zellic._

_Upstream tracking issue: https://github.com/uutils/coreutils/issues/10020 · CVE-2026-35341_

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Weakness class

CVE-2026-35341 is classified as CWE-732: Incorrect Permission Assignment for Critical Resource. A sensitive resource is assigned permissions that let unintended actors read or modify it.

Affected software

CVE-2026-35341 is recorded against 2 packages.

  • coreutils
  • uu-mkfifo

Timeline and source

Published on 22 April 2026 and last revised on 6 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

Other advisories for this package

coreutils has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-732: Incorrect Permission Assignment for Critical Resource) in other software:

CVE-2026-35341 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE CWE-732
Public Exploit ⚠️ Yes
Source OSV
Published 2026-04-22
Updated 2026-08-20
Modified 2026-07-06
Fix URL N/A

Affected Packages

Software From version Fixed in
coreutils — —
uu-mkfifo — —

Similar Threats

Exploit Protection

Are you running coreutils?

CVE-2026-35341 carries CVSS 8.0 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

Check My Site For CVE-2026-35341 →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

Browse related advisories

All advisoriesCVECVE 2026
✓