FreeBSD : h2o -- HTTP/2 state amplification denial of service (35c57495-2231-4733-a66e-044f3dad8b21)

high Nessus Plugin ID 320877

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 35c57495-2231-4733-a66e-044f3dad8b21 advisory.

h2o project reports:
An HTTP/2 attack can combine HPACK decompression state amplification with stalled streams. Depending on server configuration, decoded header state can be retained by stalled streams, causing excessive memory use and denial of service.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 320877

File Name: freebsd_pkg_35c5749522314733a66e044f3dad8b21.nasl

Version: 1.1

Type: Local

Family: FreeBSD Local Security Checks

Published: 6/12/2026

Updated: 6/12/2026

Supported Sensors: Nessus

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:h2o, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2026

Vulnerability Publication Date: 6/4/2026

Detections

Analytics