CVE-2026-3547

Description

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.

PUBLISHED Reserved 2026-03-04 | Published 2026-03-19 | Updated 2026-03-21 | Assigner wolfSSL

Problem types

CWE-125: out-of-bounds read

Product status

Credits

Oleh Konko finder

References

github.com/wolfSSL/wolfssl/pull/9859 patch

cve.org (CVE-2026-3547)

nvd.nist.gov (CVE-2026-3547)

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