CVE-2026-35370: Uu id Groups= Computed From Real GID Vulnerability

MODERATE
Advisory Identifier: GHSA-47c7-qrm7-mqw7
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CVSS 4.4
CWE-273 CWE-863
Published
Advisory Summary

CVE-2026-35370 is a MODERATE (CVSS 4.4) groups= computed from real gid vulnerability (CWE-273: Improper Check for Dropped Privileges) affecting Uu id libraries in the crates.io ecosystem. The issue involves groups= computed from real gid instead of effective gid. Remediation is available by upgrading affected packages to version 0.6.0.

CVE-2026-35370 at a Glance

CVE Identifier CVE-2026-35370
GHSA Identifier GHSA-47c7-qrm7-mqw7
Severity MODERATE
CVSS v3.1 Base Score 4.4
CWE Classification CWE-273: Improper Check for Dropped Privileges
Affected Product Uu id
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 4.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-35370

To remediate this vulnerability, upgrade all affected Uu id dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

uu_id fixed: 0.6.0 
Upgrade uu_id to 0.6.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for uu_id

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-35370, inspect your project dependencies for Uu id:

inspect dependencies for uu_id

Analyze the terminal output to locate any version of Uu id in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-273: Improper Check for Dropped Privileges, where the product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded. In Uu id, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The id utility in uutils coreutils miscalculates the groups= section of its output. The implementation uses a user's real GID instead of their effective GID to compute the group list, leading to potentially divergent output compared to GNU coreutils. Because many scripts and automated processes rely on the output of id to make security-critical access-control or permission decisions, this discrepancy can lead to unauthorized access or security misconfigurations. --- _Zellic finding 3.72. Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._

CVE-2026-35370 Affected Uu id Versions

1 component(s)
Fixed Versions:
0.6.0
Product / Package Ecosystem Affected Versions Fixed Version
uu_id
 crates.io
< 0.6.0
0.6.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/uutils/coreutils/security/advisories/GHSA-47c7-qrm7-mqw7
NVD — CVE-2026-35370 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35370
Uu id Source Repository REPOSITORY
https://github.com/uutils/coreutils/issues/10006
Uu id Source Repository REPOSITORY
https://github.com/uutils/coreutils

Frequently Asked Questions

What is CVE-2026-35370?
CVE-2026-35370 is a security vulnerability in Uu id involving groups= computed from real GID instead of effective GID under CWE-273: Improper Check for Dropped Privileges.
Which Uu id versions are affected?
Affected versions include releases prior to 0.6.0 across affected packages: uu_id.
What version fixes CVE-2026-35370?
Upgrading to 0.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is uu_id affected?
Yes, uu_id is affected in releases prior to 0.6.0. Upgrade your dependency to 0.6.0 or later.
What is the CVSS score of CVE-2026-35370?
CVE-2026-35370 has a CVSS v3.1 base score of 4.4 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-35370?
CVE-2026-35370 is classified under CWE-273: Improper Check for Dropped Privileges (The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.).
How can I check crates.io dependencies for CVE-2026-35370?
Run the dependency tree command: 'inspect dependencies for uu_id'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-47c7-qrm7-mqw7",
  "modified" : "2026-07-06T20:16:46Z",
  "published" : "2026-07-06T20:16:46Z",
  "aliases" : [ "CVE-2026-35370" ],
  "summary" : "id: groups= computed from real GID instead of effective GID",
  "details" : "The id utility in uutils coreutils miscalculates the groups= section of its output. The implementation uses a user's real GID instead of their effective GID to compute the group list, leading to potentially divergent output compared to GNU coreutils. Because many scripts and automated processes rely on the output of id to make security-critical access-control or permission decisions, this discrepancy can lead to unauthorized access or security misconfigurations.\n\n---\n_Zellic finding 3.72. Reported in the Zellic *uutils coreutils Program Security Assessment* (for Canonical, Jan 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`._",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "uu_id"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/security/advisories/GHSA-47c7-qrm7-mqw7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35370"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/issues/10006"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/uutils/coreutils"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-273", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-06T20:16:46Z",
    "nvd_published_at" : null
  }
}