CVE-2026-3548
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductWolfssl
PublishedMar 19, 2026
First seenMar 19, 2026
Weakness typeCWE-787Out-of-bounds writeCWE-122CWE-122
How to fix
Update
- wolfssl wolfssl5.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | v < 5.9.0 | 5.9.0 |
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