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TI-2026-21065 Aliases CVE-2026-26061GHSA-99hj-44vg-hfcp

Fleet's unbounded request body read allows remote Denial of Service

Priority MEDIUM 44CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by sending large or repeated HTTP payloads, causing excessive memory allocation and resulting in a denial-of-service (DoS) condition. Version 4.81.0 patches the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00451 39th percentileScored 2026-11-07
Fix Fixed fleet (fleetdm): 4.81.0github.com/fleetdm/fleet/v4 (Go): 4.43.5-0.20260113202849-bbc1aef2987d

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fleetdmfleetbefore 4.81.04.81.0Patch availableCNA
—github.com/fleetdm/fleet/v4 (Go)before 4.43.5-0.20260113202849-bbc1aef2987d4.43.5-0.20260113202849-bbc1aef2987dPatch availableGHSA-99hj-44vg-hfcp
  • fleet Vendorfleetdm Affected before 4.81.0 Fixed in 4.81.0 Patch available CNA
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected before 4.43.5-0.20260113202849-bbc1aef2987d Fixed in 4.43.5-0.20260113202849-bbc1aef2987d Patch available GHSA-99hj-44vg-hfcp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*before 4.81.0Vulnerablefleetdm
  • cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:* Versions before 4.81.0 Vulnerable ·fleetdm

Remediation

  • Fix · CNA fleet (fleetdm) Fixed in 4.81.0
  • Fix · GHSA-99hj-44vg-hfcp github.com/fleetdm/fleet/v4 (Go) Fixed in 4.43.5-0.20260113202849-bbc1aef2987d Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26061
  2. 2026-10-03 Alias added: GHSA-99hj-44vg-hfcp

References

Advisory 2

Other 1

  • TI-2026-65639 Fleet before 4.87.0 Authentication Bypass via Device Identifiers CVSS 4.0CRITICAL 9.3
  • TI-2026-18942 Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment CVSS 4.0CRITICAL 9.3
  • TI-2020-16097 SAML authentication vulnerability in Fleet CVSS 3.1CRITICAL 10.0
  • TI-2026-21066 Fleet server may terminate unexpectedly when handling certain gRPC requests CVSS 4.0HIGH 8.7
  • TI-2026-20084 Fleet Windows MDM Azure AD JWT Authentication Bypass CVSS 4.0HIGH 8.2
  • TI-2026-19339 Fleet has a rate limiting bypass via untrusted client IP headers CVSS 4.0MEDIUM 6.9
See all 31 →

Sources

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