---
id: CVE-2026-110755
title: >-
  Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying
  the unparsed remainder per record of CR-only input in getline
summary: >-
  Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying
  the unparsed remainder per record of CR-only input in getline.


  With eol unset, the default, getline reads with Perl's default line separator,
  so input with CR…
severity: none
cwe:
  - CWE-407
product: Text-CSV_XS
affected:
  - Text-CSV_XS < 1.65
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T22:07:10.643Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110755'
references:
  - url: >-
      https://github.com/cpan-authors/Text-CSV_XS/commit/f25e00aacd6fc15857b22487cb2e5ca263f377e0.patch
  - url: 'https://metacpan.org/release/HMBRAND/Text-CSV_XS-1.65/changes'
tags:
  - cve.org
ingestedAt: '2026-10-16T22:54:45.851Z'
---

## Overview

Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline.

With eol unset, the default, getline reads with Perl's default line separator, so input with CR-only line endings arrives as one chunk. After each record the parser copies the whole unparsed remainder into a new buffer, which the next call parses and copies again, so the work grows with the square of the input size.

A reader with default options that is sent CSV with classic Mac line endings spends seconds of CPU time on a megabyte of input.

## Affected

- `Text-CSV_XS < 1.65`

## Remediation

Upgrade to Text-CSV_XS 1.65 or later.