EUVD-2026-13166
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Description
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.
Analysis
Denial of service in Nginx via out-of-bounds read during ALPN protocol parsing when ALPN support is enabled, allowing unauthenticated remote attackers to crash the process by sending a crafted ALPN list. This vulnerability affects Nginx and other third-party applications that have compiled wolfSSL 5.8.4 or earlier with ALPN enabled. …
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Remediation
Within 24 hours: Identify all systems running wolfSSL 5.8.4 or earlier with ALPN enabled and confirm whether they use affected third-party integrations (Apache, Nginx, HAProxy, BIND, Curl, etc.). Within 7 days: Test and deploy available patches in non-production environments. …
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External POC / Exploit Code
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