uutils coreutils printenv Security Inspection Bypass via UTF-8 Enforcement

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Summary

CVECVE-2026-35366
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 17:16:40 UTC
Updated2026-05-04 18:52:42 UTC
DescriptionThe printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte sequences. While POSIX permits arbitrary bytes in environment strings, the uutils implementation silently skips these entries rather than printing the raw bytes. This vulnerability allows malicious environment variables (e.g., adversarial LD_PRELOAD values) to evade inspection by administrators or security auditing tools, potentially allowing library injection or other environment-based attacks to go undetected.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.000120000 probability, percentile 0.016120000 (date 2026-05-05)

Problem Types: CWE-754 | CWE-754 CWE-754: Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Uutils Coreutils All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Uutils Coreutils affected 0.6.0 semver Linux, Unix, macOS

References

ReferenceSourceLinkTags
github.com/uutils/coreutils/pull/9728 [email protected] github.com Issue Tracking, Patch
github.com/uutils/coreutils/releases/tag/0.6.0 [email protected] github.com Release Notes
github.com/uutils/coreutils/issues/9701 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Issue Tracking
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zellic (en)

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