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High severity7.5NVD Advisory· Published Mar 19, 2026· Updated Jun 17, 2026

CVE-2026-3547

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.

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Affected products

3
  • WolfSSL/Wolfssl3 versions
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*range: <5.9.0
    • (no CPE)range: 0
    • (no CPE)range: <=5.8.4

Patches

Vulnerability mechanics

References

1

News mentions

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