| Name | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| wolfssl (PTS) | bullseye | 4.6.0+p1-0+deb11u2 | vulnerable |
| bookworm | 5.5.4-2+deb12u2 | vulnerable | |
| trixie | 5.7.2-0.1+deb13u1 | vulnerable | |
| forky | 5.8.4-1 | vulnerable | |
| sid | 5.9.0-0.1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| wolfssl | source | (unstable) | 5.9.0-0.1 |
https://github.com/wolfSSL/wolfssl/pull/9859
https://github.com/wolfSSL/wolfssl/pull/9860
Fixed by: https://github.com/wolfSSL/wolfssl/commit/9d3cc6e30c778b124002cc45b7974d718b6649fd (v5.9.0-stable)