CVE-2026-3547
wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
11th
Out-of-bounds read in ALPN parsing due to incomplete validation. wolfSSL 5.8.4 and earlier contained an out-of-bounds read in ALPN handling when built with ALPN enabled (HAVE_ALPN / --enable-alpn). A crafted ALPN protocol list could trigger an out-of-bounds read, leading to a potential process crash (denial of service). Note that ALPN is disabled by default, but is enabled for these 3rd party compatibility features: enable-apachehttpd, enable-bind, enable-curl, enable-haproxy, enable-hitch, enable-lighty, enable-jni, enable-nginx, enable-quic.
| CWE | CWE-125 |
| Vendor | wolfssl |
| Product | wolfssl |
| Published | Mar 19, 2026 |
| Last Updated | Mar 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
wolfSSL / wolfSSL
0 < 5.9.0
Credits
Oleh Konko