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CVE-2026-56159Patch(microsoft / windows_10_1607)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_10_1607 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

microsoft CVEsBack to dashboard
1.0/ 10 priority

Sources & remediation

Patch / fix
Weakness type (CWE)
CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • windows_10_1607
  • windows_10_1809
  • windows_server_2012
  • windows_server_2016

Threat summary

  • Patch or workaround signal is available
  • 5 mentions across 5 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 3 signals
  • Technical details provided in 5 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • Peaked 4d ago at 1 mentions (2026-07-15); latest day: 1
  • 5 total mentions across 5 days

Affected systems

Vendors
microsoft
Products
windows_10_1607windows_10_1809windows_server_2012windows_server_2016windows_server_2019windows_server_2022windows_server_2025

2 versions affected across 7 products

Deep dive

Activity timeline5 mentions / 5d
00111Mentions · 2026-07-15: 1Mentions · 2026-07-16: 1Mentions · 2026-07-22: 1Mentions · 2026-08-07: 1Mentions · 2026-09-06: 1Patch / Workaround · 2026-07-15: 1Patch / Workaround · 2026-07-16: 1Patch / Workaround · 2026-07-22: 1Technical Details · 2026-07-15: 1Technical Details · 2026-07-16: 1Technical Details · 2026-07-22: 1Technical Details · 2026-08-07: 1Technical Details · 2026-09-06: 107-1507-1607-2208-0709-06
Signal classification3 categories
Patch
360.0%
Disclosure
120.0%
General
120.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-07-151
Patch1
2026-07-161
Patch1
2026-07-221
Patch1
2026-08-071
Disclosure1
2026-09-061
General1
Full discourse5 posts
  • GovCERT.CZ@GOVCERT_CZ
    Patch

    🚨Upozorňujeme na zranitelnost ve Windows DHCP Server, CVE-2026-56159. Jedná se o zranitelnost, která umožňuje vzdálené spuštění kódu (RCE). Neautentizovaný vzdálený útočník může zasláním speciálně upraveného paketu na DHCP server vyvolat přetečení vyrovnávací paměti na haldě a následně spustit libovolný kód na cílovém systému. Úspěšné zneužití může vést k úplnému kompromitování zranitelného serveru bez nutnosti předchozí autentizace. Zranitelnost postihuje systémy Windows 10 (verze 1607 a 1809) a Windows Server 2012, 2012 R2, 2016, 2019, 2022 a 2025 včetně instalací Server Core. Microsoft vydal opravy v rámci standardních kumulativních aktualizací. 📌Doporučujeme aktualizovat na nejnovější verzi.

    Post summary

    The message alerts to a remote code execution vulnerability (CVE‑2026‑56159) in Windows DHCP Server affecting several Windows editions and stresses updating through Microsoft’s cumulative patches.

    05062617
    4.3K followersView on X
  • SecAlerts@SecAlertsCo
    Patch

    Windows DHCP Server RCE confirmed 🌐 CVE-2026-56159 is a heap overflow enabling unauthenticated remote code execution. Affects Windows 10 and Server 2012, 2012 R2, 2016, 2019, 2022 & 2025. Patch now. #Microsoft #cybersecurity https://secalerts.co/vulnerability/CVE-2026-56159?utm_campaign=x https://t.co/VXiXYgCUce

    Post summary

    The post announces CVE-2026-56159 as a heap-overflow RCE on Windows DHCP servers and urges readers to apply the available patch.

    00111176
    888 followersView on X
  • IntegSec@integ_sec
    General

    CVE-2026-56159: Windows DHCP Server Heap-Based Buffer Overflow - What It Means for Your Business and How to Respond https://hubs.li/Q04wQ1VP0

    Post summary

    The snippet references CVE-2026-56159 as a Windows DHCP Server heap‑based buffer overflow but lacks details on PoC, exploitation, active use, or remediation.

    0000048
    35 followersView on X
  • NCA Azerbaijan@NCAAzerbaijan
    Disclosure

    "Windows DHCP Server" xidmətində uzaqdan kod icrası riski (CVE-2026-56159) aşkarlanıb. #MKA #NCA #MilliCERT #Kibertəhlükəsizlik #Xəbərdarlıq https://t.co/furfXIsPlF

    Post summary

    A new remote code execution vulnerability (CVE-2026-56159) was announced for Windows DHCP Server, indicating the issue has been discovered but no exploitation details or patches have been provided.

    00000320
    136 followersView on X
  • Windows Forum@windowsforum
    Patch

    🚨 Windows DHCP has an unauthenticated RCE flaw—because even handing out IP addresses needs a security patch. Admins should deploy the July 14 update before attackers start assigning themselves access. https://windowsforum.com/threads/cve-2026-56159-patch-windows-dhcp-rce-by-july-14-2026.438773/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #PatchManagement #WindowsServerSecurity #WindowsDhcp https://t.co/I2b2V0FLBB

    Post summary

    The post announces an unauthenticated RCE flaw in Windows DHCP (CVE‑2026‑56159) and urges administrators to apply the July 14 patch to prevent potential exploitation.

    0000020
    1.2K followersView on X
CPE platform detail10 entries

10 of 10 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_10_1607--x64
OSmicrosoftwindows_10_1607--x86
OSmicrosoftwindows_10_1809--x64
OSmicrosoftwindows_10_1809--x86
OSmicrosoftwindows_server_2012---
OSmicrosoftwindows_server_2012r2--
OSmicrosoftwindows_server_2016---
OSmicrosoftwindows_server_2019---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2025---

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