wolfSSL up to 5.8.x SSL CRL Parser out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in wolfSSL up to 5.8.x. This affects an unknown function of the component SSL CRL Parser. The manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2026-3548. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in wolfSSL up to 5.8.x. It has been classified as critical. Affected is an unknown functionality of the component SSL CRL Parser. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Two buffer overflow vulnerabilities existed in the wolfSSL CRL parser when parsing CRL numbers: a heap-based buffer overflow could occur when improperly storing the CRL number as a hexadecimal string, and a stack-based overflow for sufficiently sized CRL numbers. With appropriately crafted CRLs, either of these out of bound writes could be triggered. Note this only affects builds that specifically enable CRL support, and the user would need to load a CRL from an untrusted source.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-3548 since 03/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 303112 (Linux Distros Unpatched Vulnerability : CVE-2026-3548), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.9.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303112) and EUVD (EUVD-2026-13150). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• wolfSSL

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8

License

• open-source

Website

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

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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