CVE-2026-111946

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

Published Oct 19, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

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


Vendor Workaround

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"].

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Rrwo
Rrwo plack::middleware::etag
Vendors & Products Rrwo
Rrwo plack::middleware::etag
Type Values Removed Values Added
Description 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.
Title Plack::Middleware::ETag versions from 0.04 before 0.06 for Perl disclose file inode numbers in the default ETag header
Weaknesses CWE-497
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Oct 29, 2026, 5:21 PM
Reserved
Oct 17, 2026, 2:22 PM
Status
Deferred
Published
Oct 19, 2026, 9:17 PM
Modified
Oct 29, 2026, 6:17 PM