Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
2 versions affected across 13 products
| Date | Total | Labels |
|---|
| 2026-07-15 | 2 | Patch2 |
| 2026-08-17 | 1 | Patch1 |
Another Patch Tuesday, another batch of NTFS vulnerabilities fixed. My contribution this time included CVE-2026-58640, CVE-2026-50471, and CVE-2026-50494. Im also surprised to see that someone else is interested in NTFS besides me :)
Post summary
The tweet announces that a number of NTFS-related CVEs were fixed in a Patch Tuesday release, without providing technical details, PoC, or exploit information.
Three NTFS heap overflows in ntfs.sys, all triggerable via a single malicious VHD file, patched July 2026 across roughly 30 Windows client and server editions. No public PoC confirmed yet, but the forensic window before patching deserves scrutiny. - CVE-2026-50471 (CVSS 7.8), CVE-2026-50494 (CVSS 7.8), and CVE-2026-58640 (CVSS 7.3) all share the same CWE-122 root cause: ntfs.sys allocates a heap buffer using one size, writes using a mismatched length, corrupting adjacent kernel pool memory. CVE-2026-50494 is the most dangerous operationally as it requires only local low-privilege access with no user interaction to escalate to SYSTEM. The other two need a user to open the file, a trivial social engineering bar given VHD has no "are you sure" prompt on double-click since Windows 8. - The delivery chain is deliberately low-friction. Windows Explorer auto-mounts a VHD like a ZIP archive. Attackers can deliver it via email, chat, or cloud link with a plausible backup or disk image cover story. APT-C-60 already used VHDX as an attack vector in a documented campaign analyzed by Positive Technologies. - NTFS itself logs the attack. The USN Journal ($Extend\$UsnJrnl) retains create, rename, and delete events for roughly 20 days even after the VHD is removed. The $LogFile records low-level metadata transactions that can show heap corruption fingerprints even without a system crash. #DFIR_Radar
Post summary
The statement announces three NTFS heap‑overflow CVEs patched in July 2026, provides technical details and mitigation, but notes no public PoC or active exploitation has been reported.
🪟 NTFS gets an “Important” RCE fix, but attackers still need local access and user interaction. Not an internet-wide panic—just proof that “don’t open weird files” remains a security feature. https://windowsforum.com/threads/cve-2026-50471-july-updates-fix-windows-ntfs-code-execution.438488/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #WindowsSecurity #RemoteCodeExecution #PatchManagement https://t.co/ZePKFxE5Nu
Post summary
The Windows update addresses CVE‑2026‑50471, an RCE issue in NTFS, while noting that exploitation still requires local access and user interaction.
24 of 24 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| OS | microsoft | windows_10_1607 | - | - | x64 |
| OS | microsoft | windows_10_1607 | - | - | x86 |
| OS | microsoft | windows_10_1809 | - | - | x64 |
| OS | microsoft | windows_10_1809 | - | - | x86 |
| OS | microsoft | windows_10_21h2 | - | - | arm64 |
| OS | microsoft | windows_10_21h2 | - | - | x64 |
| OS | microsoft | windows_10_21h2 | - | - | x86 |
| OS | microsoft | windows_10_22h2 | - | - | arm64 |
| OS | microsoft | windows_10_22h2 | - | - | x64 |
| OS | microsoft | windows_10_22h2 | - | - | x86 |
| OS | microsoft | windows_11_23h2 | - | - | arm64 |
| OS | microsoft | windows_11_23h2 | - | - | x64 |
| OS | microsoft | windows_11_24h2 | - | - | arm64 |
| OS | microsoft | windows_11_24h2 | - | - | x64 |
| OS | microsoft | windows_11_25h2 | - | - | arm64 |
| OS | microsoft | windows_11_25h2 | - | - | x64 |
| OS | microsoft | windows_11_26h1 | - | - | arm64 |
| OS | microsoft | windows_11_26h1 | - | - | x64 |
| OS | microsoft | windows_server_2012 | - | - | - |
| OS | microsoft | windows_server_2012 | r2 | - | - |
| OS | microsoft | windows_server_2016 | - | - | - |
| OS | microsoft | windows_server_2019 | - | - | - |
| OS | microsoft | windows_server_2022 | - | - | - |
| OS | microsoft | windows_server_2025 | - | - | - |