HCL MyCloud 10.8.2 IIS Server access of memory location after end of buffer

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.9$0-$5k1.16

Summaryinfo

A vulnerability classified as very critical has been found in HCL MyCloud 10.8.2. This affects an unknown part of the component IIS Server. Performing a manipulation results in access of memory location after end of buffer. This vulnerability is cataloged as CVE-2026-56580. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, was found in HCL MyCloud 10.8.2. This affects some unknown processing of the component IIS Server. The manipulation with an unknown input leads to a access of memory location after end of buffer vulnerability. CWE is classifying the issue as CWE-788. The product reads or writes to a buffer using an index or pointer that references a memory location after the end of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

HCL MyCloud was affected by Using Components with Known Vulnerability ( IIS Server ). It may allow attackers to exploit publicly disclosed weaknesses and compromise the system.

The advisory is shared at support.hcl-software.com. This vulnerability is uniquely identified as CVE-2026-56580 since 06/22/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/21/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.9

VulDB Base Score: 9.9
VulDB Temp Score: 9.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access of memory location after end of buffer
CWE: CWE-788 / CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/22/2026 CVE reserved
07/21/2026 +29 days Advisory disclosed
07/21/2026 +0 days VulDB entry created
07/21/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: support.hcl-software.com
Status: Confirmed

CVE: CVE-2026-56580 (🔒)
GCVE (CVE): GCVE-0-2026-56580
GCVE (VulDB): GCVE-100-381009

Entryinfo

Created: 07/21/2026 20:28
Changes: 07/21/2026 20:28 (53)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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