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Vulnerability details: VCID-2ry7-trrg-gfdk
Vulnerability ID VCID-2ry7-trrg-gfdk
Aliases CVE-2026-3547
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-3547
cvssv3.1 7.5 https://github.com/wolfSSL/wolfssl/pull/9859
ssvc Track https://github.com/wolfSSL/wolfssl/pull/9859
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-3547
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3547
9859 https://github.com/wolfSSL/wolfssl/pull/9859
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/wolfSSL/wolfssl/pull/9859
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-21T03:33:12Z/ Found at https://github.com/wolfSSL/wolfssl/pull/9859
Exploit Prediction Scoring System (EPSS)
Percentile 0.14329
EPSS Score 0.00046
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:39:31.604820+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0