CVE-2026-35366

MEDIUMNVD 4.44.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.4 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
4.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 allowing library injection or other environment-based attacks to go undetected.

CVSS v3
4.4
EG Score
4.4(medium)
EPSS
6.7%
KEV
Not listed

Published

April 22, 2026

Last Modified

May 4, 2026

Advisory Details (3)

Auto-updated May 4, 2026
No patch confirmed yet.
generic

printenv skips environment variables with invalid UTF-8 · Issue #9701 · uutils/coreutils · GitHub

https://github.com/uutils/coreutils/issues/9701
generic

Release 0.6.0 · uutils/coreutils · GitHub

https://github.com/uutils/coreutils/releases/tag/0.6.0
generic

Fix printenv non-UTF8 by RenjiSann · Pull Request #9728 · uutils/coreutils · GitHub

https://github.com/uutils/coreutils/pull/9728

Vendor Advisories for CVE-2026-35366(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
coreutils—0.6.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
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  12. 2026-06-30 23:22 UTCEPSS rescore
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  15. 2026-06-28 14:07 UTCEPSS rescore
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  17. 2026-06-28 04:56 UTCEPSS rescore
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  19. 2026-06-27 03:08 UTCEPSS rescore
  20. 2026-06-25 13:49 UTCEPSS rescore
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  22. 2026-06-24 14:05 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-21 14:56 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 01:59 UTCEPSS rescore
  5. 2026-06-19 19:25 UTCEPSS rescore
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  7. 2026-06-18 17:52 UTCEPSS rescore
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  11. 2026-06-15 17:49 UTCEPSS rescore
  12. 2026-06-14 23:18 UTCEPSS rescore
  13. 2026-06-14 12:33 UTCEG score recompute
  14. 2026-06-13 23:00 UTCEPSS rescore
  15. 2026-06-12 23:12 UTCEPSS rescore
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  17. 2026-06-11 14:34 UTCEG score recompute
  18. 2026-06-11 14:00 UTCEPSS rescore
  19. 2026-06-10 22:18 UTCEPSS rescore
  20. 2026-06-10 13:22 UTCEPSS rescore
  21. 2026-06-10 04:42 UTCEG score recompute
  22. 2026-06-09 03:38 UTCEG score recompute
  23. 2026-06-08 14:17 UTCEPSS rescore
  24. 2026-06-08 14:17 UTCEPSS rescore
  25. 2026-06-07 21:23 UTCEG score recompute
  26. 2026-06-07 15:25 UTCEPSS rescore
  27. 2026-06-07 15:25 UTCEPSS rescore
  28. 2026-06-07 15:25 UTCEPSS rescore
  29. 2026-06-06 20:19 UTCEG score recompute
  30. 2026-06-06 13:47 UTCEPSS rescore
  31. 2026-06-06 13:47 UTCEPSS rescore
  32. 2026-06-05 22:47 UTCEPSS rescore
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  34. 2026-06-05 19:07 UTCEG score recompute
  35. 2026-06-05 06:10 UTCEPSS rescore
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  37. 2026-06-04 17:57 UTCEG score recompute
  38. 2026-06-04 13:12 UTCEPSS rescore
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  40. 2026-06-03 16:52 UTCEG score recompute
  41. 2026-06-02 20:13 UTCEPSS rescore
  42. 2026-06-02 15:48 UTCEG score recompute
  43. 2026-06-01 14:41 UTCEG score recompute
  44. 2026-06-01 13:52 UTCEPSS rescore
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  46. 2026-06-01 13:51 UTCEPSS rescore
  47. 2026-05-31 22:30 UTCEPSS rescore
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  49. 2026-05-31 00:16 UTCEPSS rescore
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  52. 2026-05-29 13:44 UTCEPSS rescore
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  54. 2026-05-28 13:44 UTCEPSS rescore
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  60. 2026-05-26 13:44 UTCEPSS rescore
  61. 2026-05-26 07:18 UTCEPSS rescore
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  63. 2026-05-23 00:08 UTCEG score recompute
  64. 2026-05-20 22:38 UTCEPSS rescore
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  66. 2026-05-20 16:08 UTCEG score recompute
  67. 2026-05-20 11:22 UTCEPSS rescore
  68. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-35366?
CVE-2026-35366 is a medium vulnerability published on April 22, 2026. 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…
When was CVE-2026-35366 disclosed?
CVE-2026-35366 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on May 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-35366 actively exploited?
CVE-2026-35366 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-35366?
CVE-2026-35366 has a CVSS v3 base score of 4.4 (NVD).
How do I remediate CVE-2026-35366?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35366, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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