FreeBSD : Vinyl/Varnish -- VCL string methods workspace overflow (a2fda5d7-b2fb-11f1-9800-641c67a117d8)

high Nessus Plugin ID 348243

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 a2fda5d7-b2fb-11f1-9800-641c67a117d8 advisory.

Vinyl Development Team reports:
A workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL.
This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart.
Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, ..etc).

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: 348243

File Name: freebsd_pkg_a2fda5d7b2fb11f19800641c67a117d8.nasl

Version: 1.1

Type: Local

Family: FreeBSD Local Security Checks

Published: 9/18/2026

Updated: 9/18/2026

Supported Sensors: Nessus

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:varnish7, p-cpe:/a:freebsd:freebsd:vinyl09

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/18/2026

Vulnerability Publication Date: 9/16/2026

Detections

Analytics