CVE-2026-3547
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.
- Score
- CVSS 3.1 7.5 High
- Status
- Analyzed - facts@wolfssl.com
- Published
- 2026-03-19
- Last modified
- 2026-03-21
- Weaknesses
- CWE-125
Affected products
References
- https://github.com/wolfSSL/wolfssl/pull/9859
