CVE-2026-3548
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.
- Affected products
- Wolfssl
- Wolfssl
- < 5.9.0
- CVSS 3.1
- 9.8 CRITICAL
- EPSS
- 0.5% (38th percentile)
- Weakness
- CWE-787, CWE-122
- NVD status
- Analyzed
- Published
- 2026-03-19
- Attack patterns
- CAPEC-100
Workaround
Disabling CRL processing is the only effective workaround for this issue. Preventing the overflow by validating the CRL number length requires source code modification and therefore should be considered a fix rather than a workaround.
No indexed exploits for CVE-2026-3548 yet
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No exploit for CVE-2026-3548 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.