CVE-2026-59124: Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-59124

Deserialization of untrusted data in Microsoft High Performance Computing (HPC) Pack allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoft product: High Performance Computing (HPC) Pack Unsafe deserialization Remote code execution

What: Unsafe deserialization of untrusted data in HPC Pack allows remote code execution.
Who is affected: Unauthorized attackers with network access to HPC Pack deployments.
Urgency: Critical severity (CVSS 9.8); unauthenticated network-accessible RCE in scientific computing infrastructure demands immediate patching.
Action: Apply HPC Pack security updates from Microsoft without delay and isolate affected systems if patches unavailable.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59124

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Moderate exploitation riskCVE-2026-591241.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 75% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59124	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
criticalCVE-2026-59124: Deserialization of untrusted data in Microsoft High Performance Computing (HPC) Pack allows an…nvd

Recent advisories for Microsoft High Performance

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-59133: Execution with unnecessary privileges in Microsoft High Performance Computing (HPC) Pack allow…nvd · 2026-08-11
criticalCVE-2026-59124: Deserialization of untrusted data in Microsoft High Performance Computing (HPC) Pack allows an…nvd · 2026-08-11
highCVE-2026-59133: Microsoft High Performance Computing (HPC) Pack Elevation of Privilege Vulnerabilitymsrc · 2026-08-11