Summaryinfo

A vulnerability described as problematic has been identified in mbed TLS up to 3.6.5/4.0.x. This affects an unknown function. Such manipulation leads to entropy. This vulnerability is listed as CVE-2026-34871. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in mbed TLS up to 3.6.5/4.0.x and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a entropy vulnerability. Using CWE to declare the problem leads to CWE-332. The lack of entropy available for, or used by, a Pseudo-Random Number Generator (PRNG) can be a stability and security threat. Impacted is confidentiality. CVE summarizes:

An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).

The advisory is available at mbed-tls.readthedocs.io. This vulnerability is handled as CVE-2026-34871 since 03/31/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

Upgrading to version 1.1.0, 3.6.6 or 4.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18001). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• mbed TLS

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 4.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Discussion