Vulnerability · Published Oct 16, 2026 · Assigned by CPANSec
CVE-2026-110755Text::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
High 7.5
In plain English
A high-severity security flaw in Text-CSV_XS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libtext-csv-xs-perl | no fix listed | DEBIAN-CVE-2026-110755 |
| Debian:13 | libtext-csv-xs-perl | no fix listed | DEBIAN-CVE-2026-110755 |
| Debian:14 | libtext-csv-xs-perl | 1.65-1 | DEBIAN-CVE-2026-110755 |
| Ubuntu:22.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110755 |
| Ubuntu:24.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110755 |
| Ubuntu:26.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110755 |
| Ubuntu:26.10 | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110755 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Text-CSV_XS | 0 – before 1.65 |
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H