CVE-2026-3548 Details
Description
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.
Two buffer overflow vulnerabilities have been identified in the wolfSSL CRL parser, specifically when handling CRL numbers. A heap-based buffer overflow can occur if the CRL number is incorrectly stored as a hexadecimal string, while a stack-based overflow can be triggered by CRL numbers of sufficient size. Both vulnerabilities involve out-of-bounds writes and can be exploited with carefully crafted CRLs. This issue affects wolfSSL builds that enable CRL support, particularly when a CRL from an untrusted source is loaded.
Users should update to the latest version of wolfSSL, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 19, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wolfSSL/wolfssl/pull/9628/ | [email protected] | Issue TrackingPatch |
| https://github.com/wolfSSL/wolfssl/pull/9873/ | [email protected] | ExploitIssue TrackingPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wolfssl wolfssl | < 5.9.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Initial Analysis | [email protected] |
| Mar 19, 2026 | New CVE Received | [email protected] |