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TI-2021-06348 Aliases CVE-2021-24031GHSA-5mqj-v3fr-pg3x

Incorrect default permissions in Meta Zstandard

Priority LOW 25CWE-277Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

In the Zstandard command-line utility prior to v1.4.1, output files were created with default permissions. Correct file permissions (matching the input) would only be set at completion time. Output files could therefore be readable or writable to unintended parties.

Why it matters now

EPSS 0.00465 40th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Partial Zstandard (Facebook): 1.4.1Red Hat: 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MetaZstandardbefore 1.4.11.4.1Patch availableCNA
  • Zstandard VendorMeta Affected before 1.4.1 Fixed in 1.4.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:facebook:zstandard:*:*:*:*:*:*:*:*before 1.4.1VulnerableMeta
  • cpe:2.3:a:facebook:zstandard:*:*:*:*:*:*:*:* Versions before 1.4.1 Vulnerable ·Meta

Remediation

  • Fix · CNA Zstandard (Facebook) Fixed in 1.4.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Facebook Zstandard 1.4.1, unspecified

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2021-06349 Incorrect default permissions in Meta ZstandardPriority LOW 22
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Ceph Storage 3AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix planned: Out of support scope
Not affected: 3 products
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat OpenStack Platform 16.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-24031
  2. 2026-10-03 Alias added: GHSA-5mqj-v3fr-pg3x

References

Exploit 2

Advisory 1

  • TI-2022-04490 Uncontrolled resource consumption in zstd CVSS 3.1HIGH 7.5
  • TI-2019-08927 Race condition in Meta Zstandard CVSS 3.0HIGH 8.1
  • TI-2021-06349 Incorrect default permissions in Meta Zstandard CVSS 3.1MEDIUM 4.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences