---
id: CVE-2026-111946
title: >-
  Plack::Middleware::ETag versions from 0.04 before 0.06 for Perl disclose file
  inode numbers in the default ETag header
summary: >-
  Plack::Middleware::ETag versions from 0.04 before 0.06 for Perl disclose file
  inode numbers in the default ETag header.


  When the response body is a filehandle and the file_etag option is not set,
  the ETag is built from the file's inode …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: adp
cwe:
  - CWE-497
product: Plack-Middleware-ETag
affected:
  - Plack-Middleware-ETag >= 0.04 < 0.06
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-29T17:20:50.522468Z'
published: '2026-10-19'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T17:21:25.384Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111946'
references:
  - url: >-
      https://github.com/robrwo/perl-Plack-Middleware-ETag/security/advisories/GHSA-943g-rgq5-6xc8
  - url: 'https://metacpan.org/release/RRWO/Plack-Middleware-ETag-0.06/changes'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2003-1418'
tags:
  - cve.org
epss: 0.00341
epssPercentile: 0.27649
ingestedAt: '2026-10-19T21:43:56.144Z'
---

## Overview

Plack::Middleware::ETag versions from 0.04 before 0.06 for Perl disclose file inode numbers in the default ETag header.

When the response body is a filehandle and the file_etag option is not set, the ETag is built from the file's inode number, modification time and size. Clients receiving affected responses may use the disclosed inode numbers to aid backend fingerprinting and correlation of files served through different URLs.

## Affected

- `Plack-Middleware-ETag >= 0.04 < 0.06`

## Remediation

Upgrade to Plack-Middleware-ETag 0.06 or later. Where the file_etag option is set, remove the use of "inode".

### Workarounds

For deployments that cannot upgrade to 0.06, where the file_etag option is set, remove the use of "inode". If the file_etag option is not specified, change it to ["mtime", "size"].