CVE-2026-35345: A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents

Routine

MEDIUM 5.3MITIGATE

CVE-2026-35345 is a medium-severity flaw (CVSS 5.3) affecting coreutils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents when using the --follow=name option. Unlike GNU tail, the uutils implementation continues to monitor a path after it has been replaced by a symbolic link, subsequently outputting the contents of the link's target. In environments where a privileged user (e.g., root) monitors a log directory, a local attacker with write access to that dir

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-59, CWE-367
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): Canonical Ltd. · Vendor: uutils

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 17:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

uutils coreutils MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coreutils || rpm -q coreutils || coreutils --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Downgrade not recommended

This is a core system component: downgrading can break the OS. Apply the distro update or the vendor mitigation.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35345?

coreutils: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-35345 being exploited?

CVE-2026-35345 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35345 affect?

CVE-2026-35345 affects coreutils. Severity is medium (CVSS 5.3). A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents when using the --follow=name option. Unlike GNU tail, the uutils implementation continues to monitor a path after it has been rep

How urgent is CVE-2026-35345?

Priority 24/100. Public exploit reference

Related CVEs

CVE-2026-35341 HIGH 7.1 MITIGATE A vulnerability in uutils coreutils mkfifo allows for the unauthorized modification of permissions on existing
CVE-2026-35364 MEDIUM 6.3 MITIGATE A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mv utility of uutils coreutils during cro
CVE-2026-35380 MEDIUM 5.5 UPGRADE A logic error in the cut utility of uutils coreutils causes the program to incorrectly interpret the literal t
CVE-2026-35358 MEDIUM 4.4 UPGRADE The cp utility in uutils coreutils, when performing recursive copies (-R), incorrectly treats character and bl
CVE-2026-35366 MEDIUM 4.4 UPGRADE The printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte

References

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