wolfSSL 5.8.2 TLS 1.3 KeyShareEntry Parser memory allocation

Summaryinfo

A vulnerability, which was classified as problematic, has been found in wolfSSL 5.8.2. The impacted element is an unknown function of the component TLS 1.3 KeyShareEntry Parser. Performing a manipulation results in memory allocation. This vulnerability is known as CVE-2025-11936. Remote exploitation of the attack is possible. No exploit is available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in wolfSSL 5.8.2. It has been classified as problematic. This affects an unknown functionality of the component TLS 1.3 KeyShareEntry Parser. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. The summary by CVE is:

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

The weakness was published by Jaehun Lee. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2025-11936 since 10/18/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 276575 (Linux Distros Unpatched Vulnerability : CVE-2025-11936), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (276575). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• wolfSSL

Version

• 5.8.2

License

• open-source

Website

• Product: https://github.com/wolfSSL/wolfssl/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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