CVE-2026-3547CWE-125

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

High · published March 19, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
38.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00458 · 38.7th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-03-19T20:20Z
EPSS history
Timeline
  • 19 MAR 20:20Z
    wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation
    cvelistv5