CVE-2026-3547: wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation

wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation

F-WOLFSSL-ALPN-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

7.5high

CVE-2026-3547CVEwolfSSL/wolfssl

wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation

Fixed in: wolfSSL 5.9.0

patched

details

Finding IDs: F-WOLFSSL-ALPN-001
CVE: CVE-2026-3547
GHSA: GHSA-f377-557w-vjgv
Status: patched
Fixed in: wolfSSL 5.9.0
Recorded credit: thanks to Oleh Konko (1seal) for the report (wolfSSL v5.9.0-stable release note)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE registry state: PUBLISHED
CVE state checked: 23 Sep 2026

F-WOLFSSL-ALPN-001: Memory safety. The published advisory describes an out-of-bounds read in ALPN list parsing. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-WOLFSSL-ALPN-001

Security area (1seal assessment): Memory safety. The published advisory describes an out-of-bounds read in ALPN list parsing. Reviewed 24 Sep 2026.

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How this page groups evidence

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