PatchTheCVECVE-2026-35366: The printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte
CVE-2026-35366 is a medium-severity flaw (CVSS 4.4) affecting coreutils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The 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 allo
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.4 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 94%) |
| CISA exploited list | No |
| Weakness | CWE-754 |
| Published | 2026-04-22 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2026-35366?
coreutils: upgrade to 0.6.0. Exact commands for each OS are on this page.
Is CVE-2026-35366 being exploited?
CVE-2026-35366 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-2026-35366 affect?
CVE-2026-35366 affects coreutils. Severity is medium (CVSS 4.4). The 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 rath
How urgent is CVE-2026-35366?
Priority 22/100. Public exploit reference
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