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TI-2026-76129 Aliases CVE-2026-111923GHSA-jc4v-4w5q-xhc2

Unbounded recursion in Fleet Apple MDM enrollment lets attackers crash server

Priority MEDIUM 44CWE-674Published · 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. Impact type from CWE-674.

Summary

Fleet before 4.89.0 contains an unbounded recursion flaw (CWE-674) in Apple MDM enrollment property list parsing. An unauthenticated remote attacker can send a crafted binary plist of about 150 bytes to the enrollment endpoints, which triggers runaway recursion or allocation and exhausts CPU and memory, crashing the server.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Fleet before 4.89.0 contains an unbounded recursion vulnerability in Apple MDM enrollment property list parsing that allows unauthenticated attackers to crash the server. Attackers can send a crafted binary plist payload of about 150 bytes to the enrollment endpoints, triggering exponential allocation or infinite recursion that exhausts CPU and memory.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix Fixed fleet (fleetdm): 4.89.0

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 4.89.04.89.0Patch availableCNA
  • fleet Vendorfleetdm Affected before 4.89.0 Fixed in 4.89.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*——fleetdm
  • cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:* Versions — — ·fleetdm

Remediation

Upgrade Fleet to version 4.89.0 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA fleet (fleetdm) Fixed in 4.89.0

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-111923
  2. 2026-10-18 Alias added: GHSA-jc4v-4w5q-xhc2
  3. 2026-10-18 Priority changed: MEDIUM → LOW
  4. 2026-10-19 CISA SSVC decision points changed
  5. 2026-10-19 Priority changed: LOW → MEDIUM

References

Advisory 1

  • TI-2026-29868 Fleet: Cross-Team Policy Data Exposure via Global Policy Read Endpoint CVSS 3.1MEDIUM 4.3
  • TI-2025-20341 SAML authentication vulnerability due to improper SAML response validation CVSS 4.0CRITICAL 9.3
  • 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-2026-76130 Unbounded gzip decompression in Fleet enables denial of service CVSS 4.0HIGH 8.7
See all 40 →

Sources

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