CVE-2026-3547 — wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation

CVE-2026-3547

wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
wolfSSL / wolfSSL	affected 0 before 5.9.0

CWE

CWE-125

References

https://github.com/wolfSSL/wolfssl/pull/9859

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.