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CVE-2026-58608 is a critical remote code execution vulnerability residing in the Windows Print Spooler components. The flaw is rooted in a classic race condition—specifically, improper synchronization of shared resources during concurrent operations, which Microsoft also identifies as a use-after-free memory-safety error. At its core, the Print Spooler service handles multiple concurrent print jobs and printer configuration changes without adequate mutual exclusion controls or atomic operations. When multiple threads or processes attempt to access and modify shared print queue data structures simultaneously, the lack of proper serialization creates a temporal window where the state of these resources becomes inconsistent. An attacker who is already authenticated with low-level privileges can exploit this window by crafting malicious print jobs or printer driver installations. The attack works by manipulating the shared memory regions—such as printer queue entries, driver configurations, or security descriptors—between the time a security check is performed and the time the action is executed (a time-of-check to time-of-use flaw). This allows the attacker to inject arbitrary code into the print spooler process memory space. The vulnerability is network-accessible, requires no user interaction, and has low attack complexity, making it highly dangerous. The CVSS vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, resulting in a base score of 8.8 (High). Importantly, the attack does not require elevated privileges—basic user credentials suffice. The attack surface extends across networked environments where Windows systems expose print services, potentially enabling lateral movement and privilege escalation within corporate networks. Microsoft patched this vulnerability in the July 14, 2026 cumulative security updates.
DailyCVE Form:
Platform: Windows
Version: 10,11,Server
Vulnerability: Race Condition
Severity: Critical (8.8)
Date: 2026-07-14
Prediction: Already Patched (July 2026)
What Undercode Say: Analytics
- CVSS Score: 8.8 (High) with Temporal Score 7.7
- Attack Vector: Network (remotely exploitable)
- Attack Complexity: Low (repeatable success)
- Privileges Required: Low (basic user credentials)
- User Interaction: None
- Scope: Unchanged
- Confidentiality Impact: High (total loss)
- Integrity Impact: High (total loss)
- Availability Impact: High
- CWE: CWE-362 (Race Condition) and CWE-416 (Use After Free)
- EPSS: Not yet available
- CISA KEV: Not currently listed
- SSVC: Exploitation: none, Automatable: no, Technical Impact: total
Bash Commands & Codes
Check Print Spooler service status:
sc query spooler
Stop and disable Print Spooler (if not needed):
net stop spooler sc config spooler start= disabled
Restrict remote access to Print Spooler via Group Policy:
Set-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\Printers" -Name "RegisterSpoolerRemoteRpcEndPoint" -Value 0
Verify installed updates (example for Windows 10 22H2):
Get-HotFix | Where-Object { $_.HotFixID -eq "KB5099539" }
Check OS build version:
ver
Exploit
An authenticated attacker with low privileges can exploit this vulnerability by:
1. Crafting malicious print jobs or printer driver installations that trigger concurrent access to shared print queue data structures.
2. Leveraging the race condition to manipulate the state of shared resources between the time a check is performed and when the action is executed.
3. Injecting arbitrary code into the print spooler process memory space.
4. Executing code remotely over the network without any user interaction.
5. Achieving remote code execution with the potential for lateral movement and privilege escalation within corporate networks.
While Microsoft has not published a technical walkthrough or proof of concept, the vulnerability is considered reliably exploitable due to low attack complexity.
Protection
- Deploy the July 2026 cumulative security updates immediately:
– Windows 10 21H2/22H2: Build 19044.7548 / 19045.7548 (KB5099539)
– Windows 10 1607 / Server 2016: Build 14393.9339
– Windows 10 1809 / Server 2019: Build 17763.9020
– Windows 11 24H2/25H2: July servicing packages
– Windows 11 26H1: Build 28000.2525 (KB5101649)
– Windows Server 2022: July cumulative update
2. Disable the Print Spooler service if not required.
3. Implement network segmentation to limit access to print servers.
4. Configure access controls via Windows Group Policies.
- Monitor Print Spooler service activities for anomalous behavior.
- Deploy endpoint detection solutions to identify suspicious print job patterns.
- Restrict remote RPC endpoints for the Print Spooler via registry.
Impact
- Remote Code Execution: An authenticated attacker can execute arbitrary code on the target system over the network.
- Complete System Compromise: Successful exploitation results in total loss of confidentiality, integrity, and availability.
- Lateral Movement: The vulnerability can be used as a second-stage route to move laterally within enterprise networks.
- Privilege Escalation: Although requiring only low privileges, the Print Spooler often runs with elevated privileges, potentially leading to SYSTEM-level access.
- No User Interaction Required: The attack can be carried out without any action from the victim.
- Network Exposure: Systems exposing Print Spooler functionality to the network are at highest risk.
- Enterprise-Wide Risk: Print servers, Remote Desktop Session Hosts, and multi-user Windows hosts are priority targets.
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Sources:
Reported By: nvd.nist.gov
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