# CVE-2026-56582: HCL MyCloud SSL/TLS LUCKY13 padding oracle vulnerability

Source: https://junglewise.ai/threats/cve-2026-56582-hcl-mycloud-ssl-tls-lucky13-padding-oracle-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-56582 · Severity: low · CVSS 3.1 · Published 2026-07-21

HCL MyCloud, a cloud management platform, is affected by a cryptographic vulnerability that could allow an attacker to decrypt secure communications. By exploiting a weakness in how the system handles encrypted data, an attacker could potentially intercept and read sensitive information. This could lead to the exposure of private data or credentials transmitted through the platform.

Technologies: [HCL Software MyCloud](https://junglewise.ai/threats/technologies/mycloud). Vendors: [HCL Software](https://junglewise.ai/threats/vendors/hcl-software).

## Quick answers

**Is CVE-2026-56582 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56582 being exploited in the wild.

**How severe is CVE-2026-56582?** Low severity, with a CVSS score of 3.1, published 21 July 2026.

**Which products and versions are affected?** HCL Software MyCloud 10.8.2.

**Is there a fix for CVE-2026-56582?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-56582 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-56582?** Check whether you run HCL Software MyCloud at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

HCL MyCloud version 10.8.2 is vulnerable to the LUCKY13 timing attack (CWE-327). This vulnerability exists in the implementation of the TLS protocol when using Cipher Block Chaining (CBC) mode padding. A remote attacker with network access and the ability to perform high-precision timing measurements can act as a padding oracle. By observing small differences in the time taken to process different padding patterns, the attacker can incrementally decrypt sensitive information from the TLS session. This attack requires a high level of complexity and authenticated access (PR:L) to execute successfully.

## Affected products

- HCL Software MyCloud 10.8.2

## Timeline

- 2026-07-21: advisory: HCL Software published the security bulletin and the CVE was recorded in NVD.

## References

- [https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0132381](https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0132381)

## Related threats

- [HCL MyCloud concurrent login vulnerability](https://junglewise.ai/threats/cve-2026-56583-hcl-mycloud-concurrent-login-vulnerability)
- [HCL MyCloud missing cookie path attribute](https://junglewise.ai/threats/cve-2026-56581-hcl-mycloud-missing-cookie-path-attribute)
- [HCL MyCloud use of unmaintained components in IIS Server](https://junglewise.ai/threats/cve-2026-56580-hcl-mycloud-use-of-unmaintained-components-in-iis-server)
- [HCL MyCloud sensitive information disclosure in HTTP response](https://junglewise.ai/threats/cve-2026-56579-hcl-mycloud-sensitive-information-disclosure-in-http-response)
- [HCL MyCloud server version disclosure](https://junglewise.ai/threats/cve-2026-56578-hcl-mycloud-server-version-disclosure)