CVE-2026-39873: Connecting to a malicious SMB server may lead to unexpected system termination in Apple macOS
The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious SMB server may lead to unexpected system termination.
AI Analysis
Technical Summary
CVE-2026-39873 is a critical vulnerability in Apple macOS where connecting to a malicious SMB server may lead to unexpected system termination due to improper memory handling (CWE-119). Apple fixed this issue in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 by improving memory handling. The vulnerability has a CVSS v3.1 base score of 9.8, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can cause unexpected system termination (crash) on affected macOS systems, potentially leading to denial of service and possible compromise of system confidentiality and integrity due to memory handling flaws.
Mitigation Recommendations
This vulnerability is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should apply these updates to remediate the issue. No other mitigation or workaround is indicated in the provided data.
CVE-2026-39873: Connecting to a malicious SMB server may lead to unexpected system termination in Apple macOS
Description
The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious SMB server may lead to unexpected system termination.
CVSS v3.1
Score 9.8critical
Affected software
Apple
macOS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39873 is a critical vulnerability in Apple macOS where connecting to a malicious SMB server may lead to unexpected system termination due to improper memory handling (CWE-119). Apple fixed this issue in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 by improving memory handling. The vulnerability has a CVSS v3.1 base score of 9.8, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can cause unexpected system termination (crash) on affected macOS systems, potentially leading to denial of service and possible compromise of system confidentiality and integrity due to memory handling flaws.
Mitigation Recommendations
This vulnerability is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should apply these updates to remediate the issue. No other mitigation or workaround is indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-04-07T19:58:20.173Z
- State
- PUBLISHED
Threat ID: 6a67c1b29c2644c7f8cb0dac
Added to database: 07/27/2026, 20:38:10 UTC
Last enriched: 07/29/2026, 23:43:24 UTC
Last updated: 09/11/2026, 22:06:33 UTC
Views: 74
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