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HIGHCVE-2026-3547Published Modified CNA wolfSSL

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

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.

Metrics

CVSS v3.1
7.5
Severity
HIGH
Fixed in
5.9.0
Affected Products
1

Fix available

5.9.0
Patch commits
Affected packages
  • wolfSSL / wolfSSL
    < 5.9.0 (from 0)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References