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Full vulnerability report · 2026
CVE-2026-59124High confidence

Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability

Microsoft · Microsoft HPC Pack 2019

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Fix not verified
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-56307

No EUVD known-exploited evidence

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

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Fix not verified
01

What, why and how

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

What

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

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

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

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-502 ↗

CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionCWE-502
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-56307Official EUVD mapping

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

Official EUVD record
BSI · German · WID-SEC-W-2026-2756Microsoft Windows Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2016, Microsoft Windows 10, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Exchange, Microsoft Windows 11, Microsoft Windows Server 2025 und Microsoft Windows ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1001Multiples vulnérabilités dans Microsoft Windows

é Microsoft Windows CVE-2026-42976 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-49179 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-50472 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-54113 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-54984 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-56174 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-56179 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-58641 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59122 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59124 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59125 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59126 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59127 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59128 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59130 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59131 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59132 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59133 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-59134 du 11 août 2026 Bul

Official advisory
NBSZ-NKI · Hungarian · cve-2026-59124CVE-2026-59124

Az applikáció úgy deszerializálja a nem megbízható adatokat, hogy nem ellenőrzi az eredmény hitelességét.

Official advisory
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-23Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-61345 : apre una nuova finestra - - CVE-2026-59138 : apre una nuova finestra - - CVE-2026-59137 : apre una nuova finestra - - CVE-2026-59136 : apre una nuova finestra - - CVE-2026-59135 : apre una nuova finestra - - CVE-2026-59134 : apre una nuova finestra - - CVE-2026-59133 : apre una nuova finestra - - CVE-2026-59132 : apre una nuova finestra - - CVE-2026-59131 : apre una nuova finestra - - CVE-2026-59130 : apre una nuova finestra - - CVE-2026-59128 : apre una nuova finestra - - CVE-2026-59127 : apre una nuova finestra - - CVE-2026-59126 : apre una nuova finestra - - CVE-2026-59125 : apre una nuova finestra - - CVE-2026-59124 : apre una nuova finestra - - CVE-2026-59122 : apre una nuova finestra - - CVE-2026-59119 : apre una nuova finestra - - CVE-2026-59118 : apre una nuova finestra - - CVE-2026-59115 : apre una nuova finestra - - CVE-2026-59113 : apre una nuova finestra - - CVE-2026-58651 : apre una nuova finestra - - CVE-2026-58650 : apre una nuova finestra - - CVE-2026-58641 : apre una nuova finestra - - CVE-2026-58639 : apre una nuova finestra - - CVE-2026-58612 : apre una nuova finestra - - CVE-2026-57105 : apre una nuova finestra - - CVE-2026-57104 : apre una nuova finestra - - CVE-2026-56179 : apre una nuova finestra - - CVE-2026-56174 : apre una nuova fi

Official advisory
NCSC-NL · Dutch · NCSC-2026-0284Kwetsbaarheden verholpen in Microsoft Windows

A deserialization vulnerability in Microsoft High Performance Computing (HPC) Pack allows unauthorized remote code execution via untrusted data over a network.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
1.0.0 < 6.3.8359
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 11 Aug 2026 · Last source change 10 Sept 2026, 15:47 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-56307
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    1.00 < 2.0.1314.0 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    1.0.0 < 6.3.8359 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to vendor advisory.
    Before
    no authoritative guidance recorded
    After
    vendor advisory
    secure@microsoft.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-56307↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-59124 · cve.blacktree.nl