CVE-2026-3547

HIGH EPSS 17.0%

Published Mar 19, 20263mo ago · Modified Mar 26, 20263mo ago

7.5 CVSS 3.1

High

Published Mar 19, 2026 3mo ago

Last Modified Mar 26, 2026 3mo ago

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.

CVSS Details

Base Score

7.5

Exploitability

3.9

Impact

3.6

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

17.0% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 1

Vendor	Product	Version	Range
wolfssl	wolfssl	*	<5.9.0

References 1

github.com https://github.com/wolfSSL/wolfssl/pull/9859

Issue TrackingPatch

Remediation

github.com https://github.com/wolfSSL/wolfssl/pull/9859

Issue TrackingPatch