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TI-2020-18395 Aliases CVE-2020-35963GHSA-h5px-998j-r7c9

flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write…

Priority LOW 37CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.

Why it matters now

EPSS 0.01326 71st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*before 1.6.4VulnerableFluentBit
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*not specified by NVDRunning onLinux
  • cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:* Versions before 1.6.4 Vulnerable ·FluentBit
  • cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

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

Not affected: 1 product
  • Red Hat Advanced Cluster Management for Kubernetes 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-35963
  2. 2026-10-03 Alias added: GHSA-h5px-998j-r7c9

References

Exploit 1

Patch 1

Advisory 1

  • TI-2024-17419 fluent-bit 2.2.2 contains a Use-After-Free vulnerability in /fluent-bit/plugins/custom_calyptia/calyptia.c. CVSS 3.1HIGH 7.5
  • TI-2024-15728 In Fluent Bit 2.1.8 through 2.2.1, a NULL pointer dereference can be caused via an… CVSS 3.1HIGH 7.5
  • TI-2024-04026 Fluent Bit Memory Corruption Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2021-21547 An issue was discovered in Treasure Data Fluent Bit 1.7.1, a wrong variable is used to… CVSS 3.1HIGH 7.8
  • TI-2021-21546 An issue was discovered in Treasure Data Fluent Bit 1.7.1, erroneous parsing in… CVSS 3.1HIGH 7.8
  • TI-2025-21098 An issue in fluent-bit v.3.7.2 allows a local attacker to cause a denial of service via… CVSS 3.1MEDIUM 5.5
See all 17 →

Sources

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